Merge -c 1527048 from trunk to branch-2.1-beta to fix MAPREDUCE-5529. Fix compat with hadoop-1 in mapred.TotalOrderPartitioner by re-introducing (get,set)PartitionFile which takes in JobConf. Contributed by Robert Kanter.

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svn merge -c 1524553 Merging from trunk to branch-2.1-beta to fix HDFS-5031.

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HDFS-5268. Merging change r1527092 from branch-2

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HDFS-5265. Merge change r1527096 from branch-2.

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