HADOOP-11399. Java Configuration file and .xml files should be automatically cross-compared (rchiang via rkanter)

(cherry picked from commit 66cfe1dc73af1f8e3accebb1fa4c1bde19c78b0e)
YARN-2970. NodeLabel operations in RMAdmin CLI get missing in help command. (Contributed by Varun Saxena)
(cherry picked from commit e1ee0d45ea3315e7fbe1d28a7a35a0ce0c54483b)
YARN-2837. Support TimeLine server to recover delegation token when restarting. Contributed by Zhijie Shen
(cherry picked from commit 149512a83743715bb100feb6747b7e88301018ab)