Run Glance initialization when Glance is enabled, not just registry

Per [1] Glance registry should not be required to run since Queens.

[1] https://specs.openstack.org/openstack/glance-specs/specs/queens/approved/glance/deprecate-registry.html

Change-Id: I5477c8769ff4ae151d4d6ccb5e5d8dd5788909b0
Closes-bug: #1859847
1 file changed