run_queues is not a rabbitmq metric

Created by: git-harry

run_queues is used by the rabbitmq plugin to check that the cluster is working [1]. This metric is not giving information about the rabbitmq message queues [2]. This section of the plugin should be revisited so that is testing as intended.

[1] https://github.com/rcbops/rpc-openstack/blob/master/maas/plugins/rabbitmq_status.py#L144 [2] http://erlang.org/pipermail/erlang-questions/2012-February/064141.html