HDFS-6830. BlockInfo.addStorage fails when DN changes the storage for a block replica. (Arpit Agarwal)

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HDFS-6830. Revert accidental checkin

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HDFS-6828. Separate block replica dispatching from Balancer. Contributed by Tsz Wo Nicholas Sze.

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YARN-2212: ApplicationMaster needs to find a way to update the AMRMToken periodically. Contributed by Xuan Gong


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