YARN-1314. Fixed DistributedShell to not fail with multiple arguments for a shell command separated by spaces. Contributed by Xuan Gong.
svn merge --ignore-ancestry -c 1545486 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1545487 13f79535-47bb-0310-9956-ffa450edef68