Refactor Heat dependencies for nova compute

Allows heat to have more control of the parallelism of the deploy
and allow easy integration of the new heat dependencies required for
nova compute integration. At present is difficult understand and has
unnecessary complex dependencies.

Change-Id: Ie566b8b14cbd98fe29cc2368a96d45cc74ca4715
Co-Authored-By: Nicholas Randon <nicholas.randon@hp.com>
Merge "Refactor Heat dependencies for nova compute"