Merge r1337344, r1378178, r1397636, r1398025, r1398040, r1398481, r1407004, r1407006...

Merge r1337344, r1378178, r1397636, r1398025, r1398040, r1398481, r1407004, r1407006, r1407088, r1407528 from trunk:

* support/suexec.c: Add gcc format-string attributes to logging
  functions.
  (main): Always print uid/gid as unsigned long, and cast to avoid
  warnings (which somewhat defeats the point of the format string
  attrs, but is necessary since the size of gid/uid varies).

remove an unnecessary check in a nest loop of ap_create_environment()

s/;;/;/

No need to test for NULL before calling apr_pstrdup.

No need it apr_pcalloc here, the memory is fully initialized the line just after

cppCheck: unreadVariable - 'serviceFlag' is not used in the function, so remove it

Remove unused code. "Next week" hasn't happened in the last 10 years or so.

log client error at level debug, log broken Host header value

remove some more old unused code

remove obsolete comment from 1.3 days

Submitted by: jorton, pqf, jailletc36, jailletc36, jailletc36, jailletc36, sf, sf, sf, sf
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1416581 13f79535-47bb-0310-9956-ffa450edef68