HDFS-4393. Make empty request and responses in protocol translators can be static final members. Contributed by Brandon Li.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1434844 13f79535-47bb-0310-9956-ffa450edef68
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/trunk@1434868 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of github.com:griddynamics/yhadoop-common into trunk-gd
Merge branch 'trunk-gd' of github.com:griddynamics/yhadoop-common into fb-HADOOP-9016-trunk-gd