HDFS-4381. Merge 1432149 from trunk

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HADOOP-9192. Merge 1432158 from trunk

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HDFS-4387. test_libhdfs_threaded SEGV on OpenJDK 7. Contributed by Colin Patrick McCabe


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HDFS-4328. TestLargeBlock#testLargeBlockSize is timing out. Contributed by Chris Nauroth


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svn merge -c 1432230 FIXES: MAPREDUCE-4921. JobClient should acquire HS token with RM principal (daryn via bobby)


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svn merge -c 1429872 to add svn:ignore properties to hadoop-mapreduce-client-hs-plugins


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