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.
vhost-plugin: remove keepalive=On for now
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