Toggle multinode jobs when modifying multinode playbooks
Toggle multinode jobs when modifying multinode playbooks

zuul-jobs has multinode playbooks in playbooks/multinode/*, we want
to be triggering multinode jobs against those.

Change-Id: I8d438cc8674a50c4023eb14eb407f18eb3446c2c

openstack-infra/openstack-zuul-jobs,openstack-infra/openstack-zuul-jobs