Fix the Apache vhost plugin

Fix bug in the Apache vhost plugin that prevented it from functioning.

Change V_MATCH_HOST to %v in custom access log format so the server name
is included in the log (V_MATCH_HOST is only available when using the
mod rewrite plugin).

Bug 1058849
Update README.frontend_httpd_plugins.md

Add --nodeps to rpm command to remove the current plugin so it can
succeed.

Correct name of mcollective service.
Merge pull request #4604 from ncdc/bug/1058849-apache-vhost-plugin-fixes

Merged by openshift-bot