HDFS-4596. Shutting down namenode during checkpointing can lead to md5sum error. Contributed by Andrew Wang.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1456630 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9405. TestGridmixSummary#testExecutionSummarizer is broken. Contributed by Andrew Wang.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1456639 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9407. commons-daemon 1.0.3 dependency has bad group id causing build issues. Contributed by Sangjin Lee.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1456704 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