ceilometer: sync the DB after the upgrade process
ceilometer: sync the DB after the upgrade process

After the upgrade process, we need to synchronize the DB, otherwise the
ceilometer services can't start correctly.

Closes-bug #1328948

Change-Id: I225155b8414daddb05748a253b970626816cdcc2

dtroyer/grenade,openstack-dev/grenade,openstack-dev/grenade,dtroyer/grenade