4.0 Fix ceilometer tests

* Fix timeout failure that was caused by flavor creation
  in sanity tests, where falvor do not use

* Fix 404 error for create/update/delete alarm

Change-Id: Iac09d0a2d165145a153bb5cc81540736c74ce3a5
Closes-Bug: #1263742
Merge "4.0 Fix ceilometer tests" into stable/4.0