merge -c 1525624 FIXES: HDFS-5239.  Allow FSNamesystem lock fairness to be configurable (daryn)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1525625 13f79535-47bb-0310-9956-ffa450edef68
merge -c 1525626 FIXES: HDFS-5240. Separate formatting from logging in the audit logger API (daryn)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1525627 13f79535-47bb-0310-9956-ffa450edef68