Moved parts of ospluginutils and puppet plugin to installer core.

This is a preparation for refactoring of packstack.installer.setup_controller.Controller and packstack.installer.run_setup.
Code in this commit is not used yet

Change-Id: Iedb4c231a62e21536615f5ce9a44caaa88c8694f
Merge "Moved parts of ospluginutils and puppet plugin to installer core."