YARN-2288. Made persisted data in LevelDB timeline store be versioned. Contributed by Junping Du.
svn merge --ignore-ancestry -c 1616540 ../../trunk/


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HDFS-6781. Separate HDFS commands from CommandsManual.apt.vm. (Contributed by Akira Ajisaka)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1616576 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6781. Add file missed in previous commit.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1616577 13f79535-47bb-0310-9956-ffa450edef68
Merge r1616580 from trunk. YARN-2008. Fixed CapacityScheduler to calculate headroom based on max available capacity instead of configured max capacity. Contributed by Craig Welch

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1616581 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1616585 FIXES: MAPREDUCE-6021. MR AM should have working directory in LD_LIBRARY_PATH. Contributed by Jason Lowe


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