HADOOP-9623. Update jet3t dependency to 0.9.0 (Amandeep Khurana via Colin Patrick McCabe)

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move HADOOP-9623 to 2.2.1

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MAPREDUCE-5451. MR uses LD_LIBRARY_PATH which doesn't mean anything in Windows. Contributed by Yingda Chen.

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HADOOP-9660. Update CHANGES.txt.

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Merging r1539245 through r1539736 from trunk to branch HDFS-2832

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