YARN-2018: Merging r1592783 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1592784 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5637. Convert Hadoop Streaming document to APT (Akira AJISAKA via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1592792 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5636. Convert MapReduce Tutorial document to APT (Akira AJISAKA via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1592796 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10541. Merging change r1592803 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1592804 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10517. Merging change r1592855 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1592856 13f79535-47bb-0310-9956-ffa450edef68