Nodes should fail to join the ring with duped tokens
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                 Key: CASSANDRA-872
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-872
             Project: Cassandra
          Issue Type: Bug
    Affects Versions: 0.6
            Reporter: Stu Hood
             Fix For: 0.6, 0.7


Currently, multiple nodes can join the ring with the same token (particularly 
when people copy the data directory between machines). The symptom is that the 
new endpoint joins the ring successfully, but both nodes can only see 
themselves in the ring (according to nodetool).

Instead of this behaviour, we would want gossip to die rather than joining with 
a duped token.

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