YARN-3. Merged to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1443011 13f79535-47bb-0310-9956-ffa450edef68
YARN-357. App submission should not be synchronized (daryn)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1443016 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4905. test org.apache.hadoop.mapred.pipes (Aleksey Gorshkov via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1443027 13f79535-47bb-0310-9956-ffa450edef68