Initial commit of labs_vmbuilder module

The labs_vmbuilder module configures a labs instance to be able
to build labs images. vmbuilder configures itself from the instance
it's on. It's necessary to build lucid images on a lucid instance,
precise on precise, and so on.

Change-Id: Icb819856898c27d08243fb1f196f7ec260689324
Merge "Initial commit of labs_vmbuilder module" into production