HDFS-5239.  Allow FSNamesystem lock fairness to be configurable (daryn)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1525624 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5240. Separate formatting from logging in the audit logger API (daryn)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1525626 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4310-trunk-gd