Remove incorrect run_queues test
Remove incorrect run_queues test

The run_queues metric is load metric from the erlang environment, it
isn't directly related to rabbitmq message queues, though it is related
to node load, so a busy broker may have a higher run_queues.

However as this is a measure of load, it is not a good value for
checking replication across rabbit cluster members. This test has been
removed.

This patch also adds a couple of checks to ensure that all nodes are
clustered succesfully.

Descriptions of the variables that are used for the new tests:

Cluster_links:
A list of the other nodes in the cluster. For each node, there are
details of the TCP connection used to connect to it and statistics on
data that has been transferred.

Partitions:
List of network partitions this node is seeing.

From: https://github.com/rabbitmq/rabbitmq-management/blob/626f857dcab1532d6a7006cd7cd16aa824445969/priv/www/doc/stats.html#L653

Related: #626

git-harry/rpc-openstack,rcbops/rpc-openstack,major/rpc-openstack,shannonmitchell/rpc-openstack,xeregin/rpc-openstack,claco/rpc-openstack,shannonmitchell/rpc-openstack,galstrom21/rpc-openstack,cfarquhar/rpc-openstack,BjoernT/rpc-openstack,xeregin/rpc-openstack,git-harry/rpc-openstack,sigmavirus24/rpc-openstack,galstrom21/rpc-openstack,cloudnull/rpc-openstack,darrenchan/rpc-openstack,sigmavirus24/rpc-openstack,hughsaunders/rpc-openstack,robb-romans/rpc-openstack,mancdaz/rpc-openstack,rcbops/rpc-openstack,mancdaz/rpc-openstack,darrenchan/rpc-openstack,claco/rpc-openstack,sigmavirus24/rpc-openstack,jacobwagner/rpc-openstack,byronmccollum/rpc-openstack,darrenchan/rpc-openstack,major/rpc-openstack,byronmccollum/rpc-openstack,sigmavirus24/rpc-openstack,byronmccollum/rpc-openstack,xeregin/rpc-openstack,cloudnull/rpc-openstack,BjoernT/rpc-openstack,cfarquhar/rpc-openstack,hughsaunders/rpc-openstack,darrenchan/rpc-openstack,claco/rpc-openstack,xeregin/rpc-openstack,robb-romans/rpc-openstack,jacobwagner/rpc-openstack,prometheanfire/rpc-openstack,prometheanfire/rpc-openstack