HDFS-4124. Merge r1403304 from trunk

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Remove duplicate HDFS-4112 entries in CHANGES.txt

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HDFS-4152. Merge r1406326 from trunk

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HDFS-4206. Merge change r1410996 from trunk

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HDFS-4215. Merge r1411947 from trunk.

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Merge -c 1471556 from trunk to branch-2 to fix MAPREDUCE-4737. Ensure that mapreduce APIs are semantically consistent with mapred API w.r.t Mapper.cleanup and Reducer.cleanup; in the sense that cleanup is now called even if there is an error. The old mapred API already ensures that Mapper.close and Reducer.close are invoked during error handling. Note that it is an incompatible change, however end-users can override Mapper.run and Reducer.run to get the old (inconsistent) behaviour. Contributed by Arun C. Murthy.

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HDFS-4151. Merge r1406006 from trunk

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HDFS-4209. Merge r1414447 from trunk

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HDFS-4334. Merge r1426429 from trunk

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HDFS-4296. Merge r1420700 from trunk

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HDFS-4339. Merge change r1465835 from trunk.

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HDFS-4346. Merge change r1428167 and r1428560 from trunk

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HDFS-4346. Add a file missed in r1471598

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HDFS-4243. Merge r1416709 from trunk.

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YARN-605. Fix failing unit test in TestNMWebServices when versionInfo has parantheses like when running on a git checkout. Contributed by Hitesh Shah.
svn merge --ignore-ancestry -c 1471608 ../../trunk/


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HDFS-4340. Merge r1443169 from trunk

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