Merge r1776575, r1776578, r1776624, r1776627, r1776674, r1776734, r1776740, r1778268...

Merge r1776575, r1776578, r1776624, r1776627, r1776674, r1776734, r1776740, r1778268, r1780725, r1781030, r1781031, r1781701, r1788674, r1789800, r1790169, r1790457, r1790691, r1806985, r1812332, r1818279 from trunk:

Merge new PROXY protocol code into mod_remoteip

Fix typo in mod_remoteip's doc

Shorten RemoteIPProxyProtocolEnable to RemoteIPProxyProtocol and correct references in docs

Move attribution for mod_remoteip RemoteIPProxyProtocol from file to CHANGES

On the trunk:

* mod_remoteip: added cast to fix clang compiler error

Reinsert attribution to mod_remoteip.c for PROXY protocol

* Silence compiler warning

Set all read buckets aside in case we need to restore all during optional header processing

* modules/metadata/mod_remoteip.c: Fix GCC strict-aliasing warning
  by moving deference of header array via a different pointer type
  ("type-punning") out of line.

* modules/metadata/mod_remoteip.c (register_hooks,
  remoteip_hook_pre_connection): Reference the filter by handle rather
  than name (avoiding tree lookup by name on use).

Change tactic for PROXY processing in Optional case

Finally include feedback from Ruediger Pluem. Add slave "backoff" verified by Sander Hoentjen

Update PROXY handling by removing Optional processing

Rename RemoteIPProxyProtocolDisableHosts to RemoteIPProxyProtocolExceptions

Fix directive name in
(s/RemoteIPProxyProtocolDisableNetworks/RemoteIPProxyProtocolExceptions/)

Use cmd->cmd->name instead to be future proof.

XML update plus typo in mod_remoteip.xml.

PROXY protocol proposal corrections

Fix format pattern (%lu => %APR_SIZE_T_FMT).

Detected by maintainer mode compilation and GCC error:

.../modules/metadata/mod_remoteip.c:
In function 'remoteip_input_filter':
.../include/http_log.h:117:33:
error: format '%lu' expects argument of type
'long unsigned int', but argument 8 has type
'apr_size_t {aka unsigned int}' [-Werror=format=]

APR-ize uint types

Submitted by: druggeri, elukey, druggeri, druggeri, druggeri, icing, druggeri, rpluem, druggeri, jorton, jorton, druggeri, druggeri, druggeri, druggeri, jailletc36, lgentis, mrumph, rjung, jim
Reviewed by: druggeri, jim, minfrin

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1824248 13f79535-47bb-0310-9956-ffa450edef68