HDFS-6355. Fix divide-by-zero, improper use of wall-clock time in BlockPoolSliceScanner (cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1594338 13f79535-47bb-0310-9956-ffa450edef68
YARN-1861. Fixed a bug in RM to reset leader-election on fencing that was causing both RMs to be stuck in standby mode when automatic failover is enabled. Contributed by Karthik Kambatla and Xuan Gong.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1594356 13f79535-47bb-0310-9956-ffa450edef68
YARN-1981. Nodemanager version is not updated when a node reconnects (Jason Lowe via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1594358 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6370. Web UI fails to display in intranet under IE. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1594362 13f79535-47bb-0310-9956-ffa450edef68