Merge r1452911, r1452949, r1452954, r1453022, r1453574, r1453875, r1453876, r1453963...

Merge r1452911, r1452949, r1452954, r1453022, r1453574, r1453875, r1453876, r1453963, r1454386, r1454414, r1454415, r1458285, r1458447 from trunk:

Rough start for simple, tunneling websocket proxy support.
Compiles at this stage and that's all I know :)

force correct scheme info

We need to ensure a conn_rec

Work around blocking issues...

And now pass the initial request to the backend...

I dislike this duplication of code from mod_proxy_http()
but maybe it's inevitable. I may create ap_proxy_create_headerb()
to create a header brigade that both modules can use.

Pull out duplicated code to proxy_util...

rename extension module... tunnel is more accurate

log nums

"final" rename :)

don't strip these, ensure that they exist.

streamline

bypass reqtimeout for websockets

Keep mod_req clear. Simply scan thru input filters and
remove it within the ws submodule. Nasty, but it keeps
mod_req untouched (for now ;) )
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1492699 13f79535-47bb-0310-9956-ffa450edef68