HDFS-7424. Add web UI for NFS gateway. Contributed by Brandon Li

(cherry picked from commit 1bbcc3d0320b9435317bfeaa078af22d4de8d00c)
YARN-2301. Improved yarn container command. Contributed by Naganarasimha G R
(cherry picked from commit 258623ff8bb1a1057ae3501d4f20982d5a59ea34)
HADOOP-11348. Remove unused variable from CMake error message for finding openssl (Dian Fu via Colin P. McCabe)
(cherry picked from commit 565b0e60a8fc4ae5bc0083cc6a6ddb2d01952f32)
HDFS-7468. Moving verify* functions to corresponding classes. Contributed by Li Lu.
YARN-2189. [YARN-1492] Admin service for cache manager. (Chris Trezzo via kasha)
(cherry picked from commit 78968155d7f87f2147faf96c5eef9c23dba38db8)

Conflicts:
	hadoop-yarn-project/hadoop-yarn/bin/yarn
HDFS-7454. Reduce memory footprint for AclEntries in NameNode. Contributed by Vinayakumar B.
Merge remote-tracking branch 'remotes/origin/branch-2' into branch-2