HDFS-4680. Audit logging of delegation tokens for MR tracing. (Andrew Wang)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1522012 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch 'origin/trunk' into mr-parallelization-sigar-surefire