Allow 'cinder' as a backend for Glance
Allow 'cinder' as a backend for Glance

Allow 'cinder' as a valid Glance backend. This value is already supported
by puppet-glance.

Change-Id: I850047e32f3608b3ce490e52e2e540695cb1a4ff

openstack/puppet-tripleo,openstack/puppet-tripleo,openstack/puppet-tripleo