HADOOP-9247. Merge r1438698 from trunk

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HDFS-4444. Mrege 1439559 from trunk.

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Reverting MAPREDUCE-2264

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merge MAPREDUCE-4803 from trunk. Remove duplicate copy of TestIndexCache. Contributed by Mariappan Asokan


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HADOOP-9255. relnotes.py missing last jira (tgraves)

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merge -r 1439652:1439653 Merging YARN-133

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merge MAPREDUCE-4838 from trunk. Add additional fields like Locality, Avataar to the JobHistory logs. Contributed by Zhijie Shen


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Revert HADOOP-9241 from branch-2 as well.

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