HADOOP-9063. enhance unit-test coverage of class org.apache.hadoop.fs.FileUtil. Contributed by Ivan A. Veselovsky


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1528502 13f79535-47bb-0310-9956-ffa450edef68
YARN-677. Increase coverage to FairScheduler (Vadim Bondarev and Dennis Y via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1528524 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk