HDFS-4947. Merging change r1517040 from trunk

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MAPREDUCE-5478. TeraInputFormat unnecessarily defines its own FileSplit subclass (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1517055 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1517073 FIXES: YARN-707. Add user info in the YARN ClientToken. Contributed by Vinod Kumar Vavilapalli


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1517077 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1517085 FIXES: MAPREDUCE-5475. MRClientService does not verify ACLs properly. Contributed by Jason Lowe


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1517086 13f79535-47bb-0310-9956-ffa450edef68
YARN-905. Add state filters to nodes CLI (Wei Yan via Sandy Ryza)

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