YARN-249. Capacity Scheduler web page should show list of active users per queue like it used to (in 1.x) (Ravi Prakash via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1445674 13f79535-47bb-0310-9956-ffa450edef68