Updated openstack/openstack
Project: openstack/ceilometer  f8d673b698b958b1945598fb1e35623ce3f958c1

Switch to use oslo.db

oslo.db first stable release has been cut and we can start using it
instead of openstack/common/db/* code which is now marked obsolete.

Change-Id: Ib8b309d5c7879b54e757a98a81c223970fc40d29