Re-enable essex compatibility checks for ceilometer
Re-enable essex compatibility checks for ceilometer

Only run the checks when a patch is uploaded, for now.
We will turn them on as gating tests when we are sure
they pass.

Change-Id: Ieb8f16d3193179789c15b15def53b3c093011557

open-switch/infra_puppet-jenkins,open-switch/infra_puppet-jenkins