Have docker start script honor configuration
Have docker start script honor configuration

The test was always evaluate as true which resulted in
insecure_registry line being set even when DockerNamespaceIsRegistry
was set to false.

Change-Id: Iacb73a4908a6a27082b94fe919734e644ed47b19

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates