Add config classes to all class groups

Recent commits to the OpenStack modules have added
new [service-name]::config classes that can be used
to sest arbitrary configuration options for a service.

This patch adds those classes into the appropriate class
groups so they can be used.

Config classes do nothing by default, and can therefore be
safely included on all nodes.

Change-Id: I70c599c79c7d9e4dea9214cb1b798cb982ed5ff5
Merge "Add config classes to all class groups"