HDFS-4393. Merge 1434844 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1434852 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1434868 FIXES: HADOOP-8849. FileUtil#fullyDelete should grant the target directories +rwx permissions (Ivan A. Veselovsky via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1434870 13f79535-47bb-0310-9956-ffa450edef68