YARN-701. Use application tokens irrespective of secure or non-secure mode. Contributed by Vinod K V.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1504604 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5265. History server admin service to refresh user and superuser group mappings. Contributed by Ashwin Shankar


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1504645 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4996. ClientProtocol#metaSave can be made idempotent by overwriting the output file instead of appending to it. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1504679 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9164. Print paths of loaded native libraries in NativeLibraryChecker. (Binglin Chang via llu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1504700 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch upstream/$:{upbranch}