HADOOP-8562. Merge r1453486 from trunk

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HADOOP-9373. Merge change r1453599 from trunk

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HADOOP-9372. Merge r1453637 from trunk

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Merge changes r1453645 for HADOOP-9373, r1453675 for HADOOP-9376, r1453676 for HADOOP-9365, r1454108 for HADOOP-9364.

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svn merge -c 1485861 Merging from trunk to branch-2 to fix HDFS-4807.

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YARN-548. Add tests for YarnUncaughtExceptionHandler (Vadim Bondarev via jeagles)

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HDFS-4714. Log short messages in Namenode RPC server for exceptions meant for clients. Contributed by Kihwal Lee.

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YARN-711. Copied BuilderUtil methods in individual API records as BuilderUtils is going to be dismantled. Contributed by Jian He.
svn merge --ignore-ancestry -c 1485888 ../../trunk/


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HADOOP-8562. Merge changes r1454616 for HDFS-4573, r1454889 for HADOOP-8973, r1455360 for HDFS-4572, r1455605 for HDFS-4287 from trunk

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