Add ceph-mds.yaml to workarounds for now
Add ceph-mds.yaml to workarounds for now

This is just to help me workaround for not yet having the following fix:
https://review.openstack.org/#/c/516224/1/docker/services/ceph-ansible/ceph-mds.yaml

fultonj/tripleo-ceph-ansible,fultonj/tripleo-ceph-ansible