YARN-1303. Fixed DistributedShell to not fail with multiple commands separated by a semi-colon as shell-command. Contributed by Xuan Gong.
svn merge --ignore-ancestry -c 1544023 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1544024 13f79535-47bb-0310-9956-ffa450edef68