HADOOP-10029. Specifying har file to MR job fails in secure cluster. Contributed by Suresh Srinivas.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1531125 13f79535-47bb-0310-9956-ffa450edef68
YARN-1265. Fair Scheduler chokes on unhealthy node reconnect (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1531146 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-YAHOO-260-trunk-gd