YARN-2649. Fixed TestAMRMRPCNodeUpdates test failure. Contributed by Ming Ma
(cherry picked from commit e16e25ab1beac89c8d8be4e9f2a7fbefe81d35f3)
YARN-913 service registry: YARN-2652 add hadoop-yarn-registry package under hadoop-yarn
HDFS-7203. Concurrent appending to the same file can cause data
corruption. Contributed by Kihwal Lee.
CHANGES.txt: move HADOOP-10404 underneath branch 2.6
HADOOP-11179. Java untar should handle the case that the file entry comes without its parent directory entry. Contributed by Craig Welch.

(cherry picked from commit a1690519317068d9855174752d22ff45f0e4c962)
HDFS-7202. Should be able to omit package name of SpanReceiver on "hadoop trace -add" (iwasakims via cmccabe)
(cherry picked from commit d996235285e5047f731e3d3fc4c6e6214caa10aa)
HADOOP-11161. Expose close method in KeyProvider to give clients of Provider implementations a hook to release resources. Contribued by Arun Suresh.
(cherry picked from commit d9556e873ef4d3e68c4f0c991f856d1faa747f07)
Merge remote-tracking branch 'remotes/origin/branch-2' into branch-2