HADOOP-11265. Credential and Key Shell Commands not available on Windows. Contributed by Larry McCay.

(cherry picked from commit a7fbd4e633c18aeeda93c0f013c0a1fcd5963556)
HDFS-7335. Redundant checkOperation() in FSN.analyzeFileState(). Contributed by Milan Desai.
HDFS-7333. Improve logging in Storage.tryLock(). Contributed by Konstantin Shvachko.
HDFS-7199. DFSOutputStream should not silently drop data if DataStreamer crashes with an unchecked exception (rushabhs via cmccabe)
(cherry picked from commit 56257fab1d5a7f66bebd9149c7df0436c0a57adb)
CHANGES.txt.  Move HDFS-7199 to branch-2.6
YARN-2767. Added a test case to verify that http static user cannot kill or submit apps in the secure mode. Contributed by Varun Vasudev.

(cherry picked from commit 7a4c92a9d55fcecef066053ac30dff0fcd4ec90c)
HADOOP-11266. Remove no longer supported activation properties for packaging from pom. Contributed by Masatake Iwasaki.