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@1532533 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5330. Merging change r1532539 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1532543 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5130. Merge change r1532580 from trunk.

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