MAPREDUCE-5084. fix coverage org.apache.hadoop.mapreduce.v2.app.webapp and org.apache.hadoop.mapreduce.v2.hs.webapp (Aleksey Gorshkov via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1494687 13f79535-47bb-0310-9956-ffa450edef68
Clean up an IPC error message. Contributed by Aaron T. Myers.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1494703 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9264. Merging change r1441172 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1494705 13f79535-47bb-0310-9956-ffa450edef68
YARN-597. Merging change r1482149 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1494713 13f79535-47bb-0310-9956-ffa450edef68
YARN-852. Merging change r1494733 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1494735 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-HADOOP-9315-branch-2-gd