Add scenario test job against stable/rocky
Add scenario test job against stable/rocky

Change-Id: I9942c1a75599a18099acf849d4dc5c1704223a21

openstack/sahara-tests,openstack/sahara-tests,openstack/sahara-scenario,openstack/sahara-scenario,openstack/sahara-tests,openstack/sahara-scenario,openstack/sahara-tests