svn merge -c 1551616 FIXES: MAPREDUCE-5679. TestJobHistoryParsing has race condition. Contributed by Liyin Liang


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HADOOP-10168. Merge 1551646 from trunk.

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HDFS-5538. Merge change r1545491 from trunk.

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HDFS-5545. Merge change r1546151 from trunk.

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HDFS-5657. Merging change r1551691 from trunk

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HDFS-5536. Merge change r1547925 from trunk.

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HDFS-5312. Merge change r1548629 from trunk.

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HDFS-5629. Merge change r1549692 from trunk.

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