Merge -c 1496741 from trunk to branch-2 to fix MAPREDUCE-5326. Added version to shuffle header. Contributed by Zhijie Shen.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1496742 13f79535-47bb-0310-9956-ffa450edef68
Merge -c 1496751 from trunk to branch-2 to fix YARN-869. Move ResourceManagerAdministrationProtocol out of main YARN api. Contributed by Vinod K V.

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Preparing for hadoop-2.1.0-beta release.

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Release notes for hadoop-2.1.0-beta.

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