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
Move HDFS-4680 in CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1522049 13f79535-47bb-0310-9956-ffa450edef68
YARN-1176. RM web services ClusterMetricsInfo total nodes doesn't include unhealthy nodes (Jonathan Eagles via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1522062 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch 'origin/trunk' into mr-simplified-parallelization
Increase timeouts for gzip related tests in TestTextInputFormat
Increase timeouts in TestDFSIO
Fix default thread count
Fix MiniMRYarnCluster to set history server address reliably
Revert "Make MiniYARNCluster to wait for app masters to finish before shutdown"

This reverts commit cf74049227e29538c288eb79c5a83c111e94c23e.