Explicitly call ceph-create-keys after MON start
Explicitly call ceph-create-keys after MON start

... for Ceph versions >= 11.1

For versions of Ceph >= 11.1, starting ceph-mon service doesn't
implicitly call ceph-create-keys to create the client admin key [1].
Call ceph-create-keys after starting MONs to do so.

[1] http://tracker.ceph.com/issues/16036
    https://github.com/ceph/ceph/commits/cc441cbd6e146e22b84224f1e53753b780151f01

Change-Id: Id67cc875ce5e8bca7430465a30e2b02dd81c7e6a

ajarr/devstack-plugin-ceph,openstack/devstack-plugin-ceph