HADOOP-8944. Shell command fs -count should include human readable option (Jonathan Allen via aw)

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HDFS-6567. Merge r1617779 from trunk.

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Merged revision(s) 1617784 from hadoop/common/trunk:
HDFS-6847. Avoid timeouts for replaceBlock() call by sending intermediate responses to Balancer (Contributed by Vinayakumar B.)


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