Once a ceph broker request has completed and the
nova-compute service has been restarted as a result,
ensure that this does not get retriggered when the
ceph relation fires as a result of a peer unit's data
coming onto the wire and no new information is provided
to the local unit.
Change-Id: Ie359a0ec9af7edfb9d453dcf4dbd9880af324d37
Closes-Bug: 1694963