YARN-764. blank Used Resources on Capacity Scheduler page (Nemon Lou via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1490388 13f79535-47bb-0310-9956-ffa450edef68
Merge r1490392 from trunk to branch-2 for YARN-750. Allow for black-listing resources in YARN API and Impl in CS (acmurthy via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1490396 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd