Change the 'cinder_service_names' from a list to a dictionary mapping of
services, groups that install those services, and any additional
conditions around their installations. The init tasks have been updated
to run once and loop through this mapping rather than being
included multiple times and re-run against each host. This may
potentially reduce role run times.
Common variables shared by each service's template files have also been
updated to use the service namespaced variables.
Change-Id: Ifeb890cc733921a6f882e4d9cdb778e22c82e9c5
c84f90a298