Updated openstack/openstack
Project: openstack/ceilometer  e87cb66d6cbc6b93b779f038eb95f2c0159eb529

improve expirer performance for sql backend

the model has been simplified which allows us to do bulk deletes
rather than looping through and deleting records individually.
this should improve performance significantly.

Change-Id: Ie99880438d7415d805a94d78df648082d5161417
Closes-Bug: #1289166