YARN-2494. Added NodeLabels Manager internal API and implementation.
Contributed by Wangda Tan.
(cherry picked from commit db7f1653198b950e89567c06898d64f6b930a0ee)
Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/8ef83a94
YARN-2494. Added NodeLabels Manager internal API and implementation.
Contributed by Wangda Tan.
(cherry picked from commit db7f1653198b950e89567c06898d64f6b930a0ee)
Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/bb6c79f7