Fix specs for ceilometer

Backporting bugfix from upstream.

Upstream-Bug: 1353844
Upstream fix change-id: If64f1ea641c5d99c0adf2104a308c2d5442c3324

Change-Id: I620fe47748a15b4e6a6a87f832d604d19c0dd42e
Closes-bug: 1383337