change rabbitmqctl `join_cluster', add `recluster' and `change_node_type'

also, remove `cluster'.

Description for the commands:
  * recluster <clusternode>
    Instruct an offline node to try to cluster with the nodes provided when
    it comes back online. With "cluster" I mean cluster directly, only if the
    other nodes think the node is in the cluster already.
    This command is useful if we bring a node down and then change the cluster
    while it is offline.
  * change_node_type (ram|disc)
    Changed the node to the provided node type. The change will fail if the
    user is trying to create a standalone ram node.
  * join_cluster clusternode
    Same as before, but only takes one node as "discovery" node. We think
    this is better since we don't really make any attempt to verify that
    all the provided nodes are in the same cluster anyways.

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