HDFS-6507. Improve DFSAdmin to support HA cluster better. (Contributd by Zesheng Wu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1604692 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6580. FSNamesystem.mkdirsInt should call the getAuditFileInfo() wrapper. Contributed bu Zhilei Xu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1604704 13f79535-47bb-0310-9956-ffa450edef68