YARN-227. Application expiration difficult to debug for end-users (Jason Lowe via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1453092 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5027. Shuffle does not limit number of outstanding connections (Robert Parker via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1453100 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-0.23' into branch-0.23-gd