This patch refactors the database creation to db_setup.yml which
will eventually be managed by openstack-ansible-tests.
This also re-orders the mq_setup to be done earlier so these system
level dependencies are ready before service activation.
Depends-On: https://review.opendev.org/660558
Change-Id: If3ac6a4e7002740c8409aef6d378d88bc287a9e7