Add ability to disable installation of nova utilities

Install them by default, preserving previous behavior.

Conflicts:
	manifests/init.pp
	spec/classes/nova_init_spec.rb

Change-Id: I01ab67330b4a66f0af44a0c83c81dc9601cf57b5
Closes-bug: #1281392
(cherry picked from commit d39d4c42f17958e7973ebf9c757a4553799d9795)
Merge "Add ability to disable installation of nova utilities" into stable/havana