HDFS-6517. Remove hadoop-metrics2.properties from hdfs project (Akira AJISAKA via aw)

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Merge r1616302 from trunk. YARN-2374. Fixed TestDistributedShell#testDSShell failure due to hostname dismatch. Contributed by Varun Vasudev

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HDFS-6791. Merge change r1616306 from trunk.

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