Updated openstack/openstack
Project: openstack-infra/devstack-gate  a7c0553d3f0190f386f22f6759f429397bb68cb7

Add oslo.db to the devstack gate

oslo.db going to became a separate library, so we should add it
to the devstack-gate.

Related to blueprint oslo-db-lib

Change-Id: I023eda5443f44d9b9aee008eb5cab97dc862b096