Fix image service endpoint spec

After converging with telemetry and image, the ceilometer meters and
resources for glance do not appear, the logs show that the glance API
URL is incorrect: http://127.0.0.1:9292/v2/v1.

The openstack-common cookbook was updated to set the right path but we
need to update the test cases.

Change-Id: I656e133995b4cbad12540d03c97adf1164b0f4c5
Closes-Bug: #1293688