HDFS-5288. Merging change r1544352 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1544359 13f79535-47bb-0310-9956-ffa450edef68
YARN-1320. Fixed Distributed Shell application to respect custom log4j properties file. Contributed by Xuan Gong.
svn merge --ignore-ancestry -c 1544364 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1544365 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5407. Merging change r1544362 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1544378 13f79535-47bb-0310-9956-ffa450edef68