Merge -c 1430682 from trunk to branch-2 to fix YARN-2. Enhanced CapacityScheduler to account for CPU alongwith memory for multi-dimensional resource scheduling. Contributed by Arun C. Murthy.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1430683 13f79535-47bb-0310-9956-ffa450edef68