add tempest-cells-full tests to check queue

apparently we don't even try to run cells tempest tests at all any
more, so we have no idea what the state of cells is in Nova. This should
be run on nova, devstack, and tempest so that we have some idea of
the current state of things.

Change-Id: Ib1d1ca46e5c0cf715f16d600b0aa40f4a17e930d