YARN-1891. Added documentation for NodeManager health-monitoring. Contributed by Varun Vasudev.
svn merge --ignore-ancestry -c 1582891 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1582893 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5810. Removed the faulty and failing streaming test TestStreamingTaskLog. Contributed by Akira Ajisaka.
svn merge --ignore-ancestry -c 1582896 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1582897 13f79535-47bb-0310-9956-ffa450edef68
Merge r1582913 from trunk. YARN-1017. Added documentation for ResourceManager Restart.(jianhe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1582917 13f79535-47bb-0310-9956-ffa450edef68