Merge of 1761479,1761548,1762703,1763158 from trunk

mod_http2: rewrite of how responses and trailers are transferred between
     master and slave connection. Reduction of internal states for tasks
     and streams, stability. Heuristic id generation for slave connections
     to better keep promise of connection ids unique at given point int time.
     Fix for mod_cgid interop in high load situtations.
     Fix for handling of incoming trailers when no request body is sent.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1763163 13f79535-47bb-0310-9956-ffa450edef68

Rebuild.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1763018 13f79535-47bb-0310-9956-ffa450edef68

xml update.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1763016 13f79535-47bb-0310-9956-ffa450edef68

Note a problem with the -Werror proposal

Will follow up on-list.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1762689 13f79535-47bb-0310-9956-ffa450edef68

rebuild

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1762660 13f79535-47bb-0310-9956-ffa450edef68

Show the example of how to do what you said to do

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1762653 13f79535-47bb-0310-9956-ffa450edef68

Propose (mod_proxy logging).

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1762522 13f79535-47bb-0310-9956-ffa450edef68

Rebuild

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1762138 13f79535-47bb-0310-9956-ffa450edef68

XML updates.

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Merge r1753315, r1753316 from trunk:

configure: move away from obsolete AC_OUTPUT args

AC_OUTPUT's use with arguments was obsoleted back at or before autoconf
2.50. Replace it with the preferred AC_CONFIG_FILES/AC_CONFIG_COMMANDS
calls.

configure: remove orphaned APACHE_OUTPUT macro

The last use of APACHE_OUTPUT appears to have been removed back in
r87231.
Submitted by: jchampion
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1762055 13f79535-47bb-0310-9956-ffa450edef68

xforms

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1762016 13f79535-47bb-0310-9956-ffa450edef68

Backport r1762012 & r1762013
Remove some trailing spaces to synch with trunk

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1762015 13f79535-47bb-0310-9956-ffa450edef68

Merge of 1761434,1761477 from trunk:

mod_http2: fix for output blocking race condition

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1761478 13f79535-47bb-0310-9956-ffa450edef68

xform

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1761354 13f79535-47bb-0310-9956-ffa450edef68

missing paren -- thanks to danielsh

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1761353 13f79535-47bb-0310-9956-ffa450edef68

xforms

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1761348 13f79535-47bb-0310-9956-ffa450edef68

emphasize that the config sections are not even used

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1761347 13f79535-47bb-0310-9956-ffa450edef68

xforms

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1761344 13f79535-47bb-0310-9956-ffa450edef68

backport & expand on Define in non-global scope.

We can't backport fixing Define, so explain the problem.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1761343 13f79535-47bb-0310-9956-ffa450edef68

xforms

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1761276 13f79535-47bb-0310-9956-ffa450edef68

bld break in hand-resolved conflict

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1761275 13f79535-47bb-0310-9956-ffa450edef68

Merge r1761272 from trunk:

expand third common in the expression functions doc

Explain some risks at looking at per-request environment variables
set by other modules within <If>.

http://stackoverflow.com/questions/39462011/htaccess-if-else-always-selects-else

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1761274 13f79535-47bb-0310-9956-ffa450edef68

Rebuild.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1761222 13f79535-47bb-0310-9956-ffa450edef68

XML updates.

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xform

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Merge r1761215 from trunk:

feedback in   http://httpd.apache.org/docs/2.4/mod/mod_ssl.html#comment_5818

This added paragraph about optional and optional_no_ca isn't helpful.

At the TLS layer, the challenge for otpional and required are no different.

Move the caution about _no_ca up into where the option is defined
and reword.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1761217 13f79535-47bb-0310-9956-ffa450edef68

rebuild

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760976 13f79535-47bb-0310-9956-ffa450edef68

Votes.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760688 13f79535-47bb-0310-9956-ffa450edef68

lynx isn't common any more

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760550 13f79535-47bb-0310-9956-ffa450edef68

Documentation rebuild + variants (proxy_html and dbd)

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760480 13f79535-47bb-0310-9956-ffa450edef68

mod_proxy_html doc - Added a reference of ProxyHTMLLinks in the ProxyHTMLURLMap description and some examples.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760479 13f79535-47bb-0310-9956-ffa450edef68

mod_dbd connection info from trunk; rebuild other stuff

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760182 13f79535-47bb-0310-9956-ffa450edef68

Rebuild.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760177 13f79535-47bb-0310-9956-ffa450edef68

XML update.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760176 13f79535-47bb-0310-9956-ffa450edef68

XML update.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760174 13f79535-47bb-0310-9956-ffa450edef68

Revert r1760148's mergeinfo changes.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760150 13f79535-47bb-0310-9956-ffa450edef68

Add proposal+vote for mod_proxy_fcgi

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760148 13f79535-47bb-0310-9956-ffa450edef68

Vote.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760114 13f79535-47bb-0310-9956-ffa450edef68

Propose.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1760113 13f79535-47bb-0310-9956-ffa450edef68

IRC/serverfault question about AH01757

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1759731 13f79535-47bb-0310-9956-ffa450edef68

Merge r1757010, r1757011 from trunk:

Delay some memory allocation in order to save 272 bytes in the 'request' memory pool if mod_status handler is triggered and is not able to handle the request

Fix <p> tag closing syntax
Submitted by: jailletc36
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1759476 13f79535-47bb-0310-9956-ffa450edef68

promote

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1759473 13f79535-47bb-0310-9956-ffa450edef68

vote

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1759472 13f79535-47bb-0310-9956-ffa450edef68

Merge r1758307, r1758308, r1758309, r1758311 from trunk:

mpm_winnt: remove 'data' AcceptFilter in favor of 'connect'

The 'data' AcceptFilter optimization instructs Windows to wait until
data is received on a connection before completing the AcceptEx
operation. Unfortunately, it seems this isn't performed atomically --
AcceptEx "partially" accepts the incoming connection during the wait for
data, leaving all other incoming connections in the accept queue. This
opens the server to a denial of service.

Since the fix for this requires a substantial rearchitecture (likely
involving multiple outstanding calls to AcceptEx), disable the 'data'
filter for now and replace it with 'connect', which uses the AcceptEx
interface but does not wait for data.

Users running prior releases of httpd on Windows should explicitly move
to a 'connect' AcceptFilter in their configurations if they are
currently using the default 'data' filter.

Many thanks to mludha, Arthur Ramsey, Paul Spangler, and many others for
their assistance in tracking down and diagnosing this issue.

PR: 59970

mpm_winnt: remove the AcceptEx data network bucket

Follow-up to the prior commit: without an incoming data buffer, the
custom network bucket code is now orphaned and we can remove it
entirely. This has the added benefit that we are no longer using the
internal OVERLAPPED.Pointer field, which is discouraged by the MSDN
docs.

mpm_winnt: remove duplication of ap_process_connection

Further follow-up to the previous commit: now that we no longer patch a
network bucket into the brigade, we can revert to calling
ap_process_connection() directly instead of duplicating its logic.

docs: rebuild
Submitted by: jchampion
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1759471 13f79535-47bb-0310-9956-ffa450edef68

Merge r1758310 from trunk:

mpm_winnt: clear OVERLAPPED structs before reuse

MSDN documentation states that

    Any unused members of [an OVERLAPPED] structure should always be
    initialized to zero before the structure is used in a function call.
    Otherwise, the function may fail and return ERROR_INVALID_PARAMETER.

Prior to this patch, the internal state left over from previous
overlapped I/O was passed into the next call. It's unclear what effect
this might have, if any. (I have not personally witnessed an
ERROR_INVALID_PARAMETER myself.)
Submitted by: jchampion
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1759470 13f79535-47bb-0310-9956-ffa450edef68

Merge r1756852, r1756853 from trunk:

Be more consistent when we alocate this brigade.
This should save a few bytes in case of early exit and is, IMHO, cleaner.

Fix some style (spaces only)
Submitted by: jailletc36
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1759469 13f79535-47bb-0310-9956-ffa450edef68

Merge r1756846 from trunk:

Remove unused typedef uthn_dbd_conf
Submitted by: jailletc36
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1759468 13f79535-47bb-0310-9956-ffa450edef68

vote/promote

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1759195 13f79535-47bb-0310-9956-ffa450edef68

update after backport

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758802 13f79535-47bb-0310-9956-ffa450edef68

Merge of r1758083 from trunk:

mod_cgid: Resolve a case where a short CGI response causes a subsequent
     CGI to be killed prematurely, resulting in a truncated subsequent
     response.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758798 13f79535-47bb-0310-9956-ffa450edef68

vote and accept

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758797 13f79535-47bb-0310-9956-ffa450edef68

Merge of r1758558 from trunk.

mod_proxy_http2: fix for netware build

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758559 13f79535-47bb-0310-9956-ffa450edef68

Vote.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758477 13f79535-47bb-0310-9956-ffa450edef68

Some easy proposals

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758466 13f79535-47bb-0310-9956-ffa450edef68

Merge r1758446 from trunk:

Without AP_DEBUG_ASSERT, these could still be NULL during runtime

Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758447 13f79535-47bb-0310-9956-ffa450edef68

vote

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758374 13f79535-47bb-0310-9956-ffa450edef68

Merge r1757662 from trunk:

* Add missing copy of hcuri and hcexpr ftom the worker to the health check worker.

PR: 60038
Submitted by: zdeno <zdeno@scnet.sk>

Submitted by: rpluem
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758373 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758314 13f79535-47bb-0310-9956-ffa450edef68

Propose.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758312 13f79535-47bb-0310-9956-ffa450edef68

vote/promote

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758302 13f79535-47bb-0310-9956-ffa450edef68

add cgid conn_id thing

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758216 13f79535-47bb-0310-9956-ffa450edef68

Rebuild.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758117 13f79535-47bb-0310-9956-ffa450edef68

XML update.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758116 13f79535-47bb-0310-9956-ffa450edef68

Merge of r1757985,r1758003 from trunk

mod_http2: fixed bug in stream shutdown, support for nghttp2 invalid header callback from 1.14.0 and onwards.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1758011 13f79535-47bb-0310-9956-ffa450edef68

Updated backport proposal with the latest discussion on dev@
about Last-Modified header handling.
I removed jchampion's vote since it was related to a completely
different solution.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1757982 13f79535-47bb-0310-9956-ffa450edef68

Merge r1757838 from trunk:

add [flags] to syntax

per http://httpd.apache.org/docs/2.4/mod/mod_rewrite.html#comment_5728

split list of flags out of the massive CondPattern list.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1757839 13f79535-47bb-0310-9956-ffa450edef68

Merge r1754391, r1754399 from trunk:

mod_reqtimeout: Fix body timeout disabling for CONNECT requests to avoid
triggering mod_proxy_connect's AH01018 once the tunnel is established.
https://bugzilla.mozilla.org/show_bug.cgi?id=1279483#c9

mod_reqtimeout: follow up to r1754391: fix missing "else".
Submitted by: ylavic
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1757675 13f79535-47bb-0310-9956-ffa450edef68

Merge r1750854, r1750855, r1750947, r1750955, r1750960 from trunk:

ab: add SNI support when available.

ab: follow up to r1750854: put the -I at the right place for apr_getopt().

ab: follow up to r1750854.
Use SNI when available by default, and invert -I logic to now disable it.

ab: follow up to r1750854: some comments and better naming.

ab: follow up to r1750854: still better naming, and a C89 fix.
Submitted by: ylavic
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1757674 13f79535-47bb-0310-9956-ffa450edef68

Merge r1756611, r1748155 from trunk:

mod_dav: follow up to r1746207:  fix typo (missing '/') for closing tag.

mod_dav: making mod_dav.h compile with clang again
Submitted by: ylavic, icing
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1757673 13f79535-47bb-0310-9956-ffa450edef68

Merge r1753257 from trunk:

Restore 'HEAD' method as a special case of GET with the common ID
Submitted by: wrowe
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1757672 13f79535-47bb-0310-9956-ffa450edef68

Merge r1753167 from trunk:

mod_proxy_fcgi: avoid loops serving proxied error documents

This commit should solve the issue indicated in PR 55415.
Httpd loops while serving a error document if:
1) The error document's content is proxied.
2) ProxyErrorOverride is set.
The solution proposed is to limit the use of ap_die only
to the initial request. I tested the change with very basic
scenarios but I am not sure if I got all the use cases,
feedback is really welcome.

Submitted by: elukey
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1757671 13f79535-47bb-0310-9956-ffa450edef68

Merge r1752347 from trunk:

Force mod_proxy_fcgi to read the whole FCGI response
even when the content has not been modified (HTTP 304).

The problem is described in PR 59838. This patch should
avoid bogus reads causing the following issues with
HTTP 304 responses:
- AH01068: Got bogus version X, expected 1
- AH01069: Got bogus rid X, expected 1
- AH01075: Error dispatching request to :
- HTTP 503 logged instead of 304 (even if the external
  client gets correctly a 304)

As discussed on IRC the HTTP_PRECONDITION_FAILED use case
should be handled like the HTTP_NOT_MODIFIED one but it will
be done in a separate commit.

Submitted by: elukey
Reviewed/backported by: jim

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Merge r1756038 from trunk:

Fix spelling in comments and text files.
No functional change.
PR 59990

Submitted by: rjung
Reviewed/backported by: jim

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promotes

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some votes

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* Add proposal

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* Vote and promote

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* Revert errornous r1757659

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* Vote and promote

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xforms fr

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Fix some French translations in order explanations to match examples (r1757599 in trunk)

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1757601 13f79535-47bb-0310-9956-ffa450edef68

Propose fix for https://bugzilla.mozilla.org/show_bug.cgi?id=1279483

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merge of 1752145,1753498,1753541,1754129,1754414,1754534,1755323,1756844,1757524,1757534,1757540 from trunk

mod_http2: backport of latest changes
 - intermediate responses
 - graceful shutdown of connections
 - ht debug draft update

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1757542 13f79535-47bb-0310-9956-ffa450edef68

synch with trunk minus RewriteMapOptions.

PR60024 cleanups around per-dir processing/redundancy/terminology.

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Rebuild.

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XML update.

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Fix a typo (r1756991 in trunk)

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vote + promote

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One more follow up to r1756560.

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xforms

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Improve highlight and formatting. (r1756706 in trunk)
Remove some trailing spaces to synch with trunk

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Comment, promote.

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Add a 2.4.x backport patch to my proposal

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1756674 13f79535-47bb-0310-9956-ffa450edef68

Add better logging (debug) to PR 21935 proposal.

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Propose follow up to r1756560.

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Propose.

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Merge r1753594 from trunk:

* Prevent redirect loops between workers within a balancer by limiting the
  number of redirects to the number balancer members.

PR: 59864

Submitted by: rpluem
Reviewed by: rpluem, jim, ylavic

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1756563 13f79535-47bb-0310-9956-ffa450edef68

Merge r1753592 from trunk:

* Do not overwrite r->status with access_status if access_status is OK or DONE
  as in this case r->status might contain the true response code.

PR: 59869

Submitted by: rpluem
Reviewed by: rpluem, jim, ylavic

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1756562 13f79535-47bb-0310-9956-ffa450edef68

Merge r1748047 from trunk:

mod_dav: Add dav_begin_multistatus, dav_send_one_response,
dav_finish_multistatus, dav_send_multistatus, dav_handle_err,
dav_failed_proppatch, dav_success_proppatch to mod_dav.h.

Submitted by: minfrin
Reviewed by: minfrin, jim, ylavic

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1756561 13f79535-47bb-0310-9956-ffa450edef68

Merge r1746207 from trunk:

mod_dav: Add support for childtags to dav_error.

Submitted by: minfrin
Reviewed by: minfrin, jim, ylavic

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1756560 13f79535-47bb-0310-9956-ffa450edef68