Sync OpenStack commons with oslo-incubator
Sync OpenStack commons with oslo-incubator

Change-Id: Ia37f4301f149f03201e6ebe286b1256ac036d6bf

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