YARN-441. Removed unused utility methods for collections from two API records. Contributed by Xuan Gong.
MAPREDUCE-5163. Update MR App to not use API utility methods for collections after YARN-441. Contributed by Xuan Gong.
svn merge --ignore-ancestry -c 1469657 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1469658 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-HADOOP-9063-branch-2-gd