svn merge -c 1471424 FIXES: MAPREDUCE-5069. add concrete common implementations of CombineFileInputFormat (Sangjin Lee via bobby)


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HDFS-4129. Merge r1403956 from trunk

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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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