YARN-1295. In UnixLocalWrapperScriptBuilder, using bash -c can cause Text file busy errors. (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.2@1532535 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5330. Merging change 1532543 from branch-2

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.2@1532546 13f79535-47bb-0310-9956-ffa450edef68