Configure glance to use the internal swift endpoint

The glance node should be talking to swift via its internal endpoint,
this was causing problems on the ci cloud as the ci-overcloud nodes
don't have DNS.

Change-Id: Ib1cd082e77853f68d810cee9675ee7ed66e9c9da
Fixes: bug #1269709
Merge "Configure glance to use the internal swift endpoint"