Add hacking integration test support

Change-Id: If8d171c7666d8ed78dc05ffbde8f596e1a2f74fb
Reviewed-on: https://review.openstack.org/31358
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins
Gate on gate-tempest-devstack-vm-postgres.

Make gate-tempest-devstack-vm-postgres a voting job.

Change-Id: I402c3ffdacfc8fe01b30c332c255e3d65424fdec
Reviewed-on: https://review.openstack.org/31881
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Dan Prince <dprince@redhat.com>
Reviewed-by: Khai Do <zaro0508@gmail.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins