openstack: add --wait to block until the suite finishes
openstack: add --wait to block until the suite finishes

Signed-off-by: Loic Dachary <b6eae37fc74638590e3f9030895d42446505d41b@dachary.org>

ceph/teuthology,dmick/teuthology,dmick/teuthology,ktdreyer/teuthology,SUSE/teuthology,dmick/teuthology,ceph/teuthology,SUSE/teuthology,ktdreyer/teuthology,SUSE/teuthology