HADOOP-9443. Port winutils static code analysis change to trunk. Contributed by Chuan Liu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1470224 13f79535-47bb-0310-9956-ffa450edef68
YARN-594. Update test and add comments in YARN-534 (Jian He via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1470243 13f79535-47bb-0310-9956-ffa450edef68