vhost-plugin: switch from rewrite back to proxypass

Switch the primary traffic proxy for the vhost frontend plugin.
There are still other RewriteRule's that do the setting of
variables, etc.
Bug 1053485 - Changing GID_MIN in login.defs prevents app creation

This patch was originally submitted by Josep 'Pep' Turro Mauri <pep@redhat.com>
vhost-plugin: remove keepalive=On for now
Bug 1075673 - Unable to perform git deploy after binary deployment

After doing a successful binary deployment, the node is unable to
process a git deployment
Merge pull request #4850 from vbatts/408-3-rewrite_to_proxypass

Merged by openshift-bot
Bug 1074627 - Improve error handling and make more robust

* Improved error handling
* Added cgroups thawing
* Added man page
* Attempt to kill off processes with several methods
Fix broker extended
Merge pull request #4945 from jwhonce/bug/1074627

Merged by openshift-bot
Merge pull request #4946 from danmcp/master

Merged by openshift-bot
Adding test coverage
Merge pull request #4943 from bparees/binary_deploy

Merged by openshift-bot
Merge pull request #4947 from danmcp/master

Merged by openshift-bot
Bug 1007830 - Better error handling around quickstarts.json loading
Merge pull request #4933 from brenton/BZ1053485

Merged by openshift-bot
Bug 1067008 - Guard gear delete from missing Cartridge IDENT
Merge pull request #4948 from danmcp/master

Merged by openshift-bot
Merge pull request #4949 from jwhonce/bug/1067008

Merged by openshift-bot
Merge pull request #4944 from UhuruSoftware/master

Merged by openshift-bot
Bug 1076008 - Fix pgrep regex usage

* procps-3.2.8 has a bug where trailing $ in regexp causes match
  failure. Fixed in procps-ng
Bug 1076032 - Attempting to unlock closed file descriptor

* Add guard to stop attempting to unlock a closed file descriptor