Make AE repair DC aware
-----------------------

                 Key: CASSANDRA-1987
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1987
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Stu Hood


Online replication is now XDC aware, such that writes directed to another DC 
are sent to one replica in that DC, and are then fanned out.

AE repair could be made much more intelligent, and could follow this model as 
well: only one replica in a replica set should communicate XDC with the 
replicas in another DC.

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