YARN-758. Augment MockNM to use multiple cores (Karthik Kambatla via Sandy Ryza)
svn merge --ignore-ancestry -c 1509086 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1520654 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5118. Merge change r1520639 from branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1520658 13f79535-47bb-0310-9956-ffa450edef68