YARN-2492. Added node-labels page on RM web UI. Contributed by Wangda Tan
Revert "YARN-2492(wrong jira number). Added node-labels page on RM web UI. Contributed by Wangda Tan"

This reverts commit 5f57b904f550515693d93a2959e663b0d0260696.
YARN-2493. Added node-labels page on RM web UI. Contributed by Wangda Tan
YARN-2987. Fixed ClientRMService#getQueueInfo to check against queue and app ACLs. Contributed by Varun Saxena