Expire dead gossip states based on time
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                 Key: CASSANDRA-2961
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2961
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Brandon Williams
            Assignee: Brandon Williams


Currently dead states are held until aVeryLongTime, 3 days.  The problem is 
that if a node reboots within this period, it begins a new 3 days and will 
repopulate the ring with the dead state.  While mostly harmless, perpetuating 
the state forever is at least wasting a small amount of bandwidth.  Instead, we 
can expire states based on a ttl, which will require that the cluster be 
loosely time synced; within the quarantine period of 60s.

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