Handle failure of openstack endpoint

Change 4f7bf6963a1e9ae03bc0ae9189874cba561ad62f introduced finding the
endpoint via "openstack endpoint show" only.  Previously that output
was piped through grep, etc. so it handled fell back to a blank
output when the endpoints were not available.

Ignore failures of this command so the blank output is matched

Change-Id: Iae2f09784ffa38efd2f858513bf284c84c32edac
Merge "Handle failure of openstack endpoint"