ci: update multinode-3nodes-registry
ci: update multinode-3nodes-registry

... to match with other multinode jobs.

Change-Id: Icb771e598594a9555ef417e781d9a155f1863d2b

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates