Remove all usage of virtual resources

It dawned on me today that I had fundamentally misunderstood virtual resources,
and that their usage in MediaWiki-Vagrant was entirely voodoo.

What I got right:
 - Virtual resources allow a resource to be declared in multiple places.

What I got wrong:
 - You can include these multiple places without causing a duplicate definition
   conflict.
 - The resource should be declared in the same manner in all places.

Virtual resources are meant for when there are varying implementations of a
particular resource. Puppet still expects that only a single variant will be
declared for a given node.

This patch removes all usage of virtual resources from MediaWiki-Vagrant. There
should be no change in behavior / functionality.

Change-Id: I3313b394157a9daedf1bbe6e33e375c1603555db