We add hosts SCENARIO to run functional tests against roles that
runs with setup-hosts.yml play. As for now we've added test coverage for
openstack_hosts role.
We're also adding infra upgrade jobs.
Change-Id: Iefb94b31da3d84b8e48681aa4ca30322aa2b3993
Needed-By: https://review.opendev.org/c/openstack/openstack-ansible-openstack_hosts/+/774688