Add jobs for testing nova cells.

Add a job that configues nova using cells and runs the tempest smoke
tests.  There are two versions of the job.  One that runs the full
tempest suite, and one that just runs the smoke tests.

Change-Id: I77c9eeb557d96a8cba1073b7f57bf4ca7c263b9d
Reviewed-on: https://review.openstack.org/35543
Reviewed-by: James E. Blair <corvus@inaugust.com>
Reviewed-by: Sean Dague <sean@dague.net>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins