YARN-576. Modified ResourceManager to reject NodeManagers that don't satisy minimum resource requirements. Contributed by Kenji Kikushima.
svn merge --ignore-ancestry -c 1476824 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1476825 13f79535-47bb-0310-9956-ffa450edef68