HADOOP-9315. Merging change r1512096 from branch-2 to branch-2.1-beta.

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HADOOP-9315. Correct attribution in CHANGES.txt to 2.1.1-beta.

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HADOOP-9831. Merging change r1512105 from branch-2 to branch-2.1-beta.

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YARN-589. Expose a REST API for monitoring the fair scheduler (Sandy Ryza).

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Amending YARN-589.  Adding missing file from patch

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svn merge -c 1512091 from trunk for HADOOP-9820. RPCv9 wire protocol is insufficient to support multiplexing. Contributed by Daryn Sharp.


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