MAPREDUCE-4893. Fixed MR ApplicationMaster to do optimal assignment of containers to get maximum locality. Contributed by Bikas Saha.
svn merge --ignore-ancestry -c 1440749 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1440752 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-8981. Merge r1440780 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1440781 13f79535-47bb-0310-9956-ffa450edef68