Run grenade on all devstack projects.

Except quantum.

Only run on >= grizzly.

Change-Id: I51a96b08de8dbfd11b8d5e2f9e4a00d4e118b525
Reviewed-on: https://review.openstack.org/26635
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins