HDFS-6385. Show when block deletion will start after NameNode startup in WebUI. Contributed by Chris Nauroth.

(cherry picked from commit c637d6d9d5cb36b8cd5180787c5d25b68f2aa370)
(cherry picked from commit caded2545c3c773cf6e9cd21e49dcb6858a4de04)
HDFS-7313. Support optional configuration of AES cipher suite on DataTransferProtocol. Contributed by Chris Nauroth.

(cherry picked from commit 5573b3476a5a6fce0ac99c654a9a9ec90f744a20)
(cherry picked from commit 57fa43ab0acffb328b9153fccc9d384c7c5c566e)
YARN-2698. Moved some node label APIs to be correctly placed in client protocol. Contributed by Wangda Tan.

(cherry picked from commit e0233c16ebd06bb3aabeb523cd17259008e243ef)
YARN-2779. Fixed ResourceManager to not require delegation tokens for communicating with Timeline Service. Contributed by Zhijie Shen.

(cherry picked from commit d1828d94435eca21761b0ba8458f9de2f125d012)