HDFS-4369. Merging change 1433206 from trunk to branch-2

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HADOOP-9093. Merge 1433220 to branch-2

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Reverting the commit r1433222 to fix the commit message

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HADOOP-9203. Merge 1433220 to branch-2

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MAPREDUCE-4938. Merging change 1433227 from trunk to branch-2.

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YARN-328. Merge r1433231 from trunk.

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HDFS-4375. Merge 1433235 from trunk.

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