Verify config support keystone on subpath

verify-config should support keystone running on a subpath.
Currently it doesn't because it strips the entire path from the
identity endpoint in the catalog when calculating the unversioned
endpoint. The fix is to only strip off the last part of the path.

Change-Id: I0d24f83ea3243b8eeee50f8bfec28326be7c7292
2 files changed