Gate on quantum devstack.

Add gate-tempest-devstack-vm-quantum to all the projects gating
on devstack.  Make it vote.

Remove gate-devstack-vm-quantum (a subset of the above job).

Change-Id: I0046ccaf0c0febe61f14173447058b76169b4d77
Reviewed-on: https://review.openstack.org/19876
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins