HDFS-7279. Use netty to implement DatanodeWebHdfsMethods. Contributed by Haohui Mai.
HADOOP-11157. ZKDelegationTokenSecretManager never shuts down listenerThreadPool. Contributed by Arun Suresh.
(cherry picked from commit 07d489e6230682e0553840bb1a0e446acb9f8d19)
YARN-2414. RM web UI: app page will crash if app is failed before any attempt has been created. Contributed by Wangda Tan
(cherry picked from commit 81c9d17af84ed87b9ded7057cb726a3855ddd32d)
HDFS-7146. NFS ID/Group lookup requires SSSD enumeration on the server. Contributed by Yongjun Zhang

(cherry picked from commit 351c5561c2fd380ab7746ca4e91d7b838e61e03f)
HADOOP-11311. Restrict uppercase key names from being created with JCEKS.

(cherry picked from commit 48d62fad80aaa13ee1a26fca14437722ed46da25)