Updated openstack/openstack
Project: openstack/glance  aabc62ad2cdad93a5d54b168b073a73b33eb5716
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registry: log errors on failure

If an image fails to be updated/created/deleted/etc for whatever reason,
the registry server returns 500 – but there's no trace of the actual
error. Let's catch the exception log it, and then re-raise it so it
still return a 500 status code. But at least we can debug.

Change-Id: Id437f23011a10365e85914dc1934f610bfa3dd28