YARN-926. Modified ContainerManagerProtcol APIs to take in requests for multiple containers. Contributed by Jian He.
MAPREDUCE-5412. Update MR app to use multiple containers API of ContainerManager after YARN-926. Contributed by Jian He.
svn merge --ignore-ancestry -c 1506391 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1506392 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9763. Merge change r1506405 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1506408 13f79535-47bb-0310-9956-ffa450edef68