Start coordination Ra system before quorum_queues

[kjnilsson]

So that quorum_queues shuts down before coordination where khepri run inside. Quorum queues depend on khepri so need to be shut down first.

[dumbbell]

It’s a good idea. However, shouldn’t we just lists:reverse/1 the list in rabbit_ra_systems:ensure_stopped/0? This way, we ensure that the systems list corresponds to the starting order and the stop function should be fixed to stop in opposite order as the starte one.