rabbitmq-server-ha: Revert "OCF RA: Do not start rabbitmq if notification of start is not about us" (#1713)

This reverts https://github.com/rabbitmq/rabbitmq-server-release/commit/2f284bf595dbbe1938a1ce3028b0299b1a75a6cc#diff-b8a3b79102e79858316f3690ea5a5f20L2185

Every time we get a start notification, all nodes should ensure
the rabbitmq app is started (even if nodes that are already active).
This is needed to mitigate a corner case described in

https://bugs.launchpad.net/fuel/+bug/1455761

This has the side effect of updating the start time for
each of these nodes, but that is fine. That could result in the master
moving to another node. That is totally fine as well, since the master
role only means the target for other nodes to join the cluster, and
has no other meanings, neither does that affect running nodes and its
state.

Signed-off-by: Bogdan Dobrelya <bdobreli@redhat.com>