YARN-968. RM admin commands don't work. Contributed by Vinod Kumar Vavilapalli.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1506675 13f79535-47bb-0310-9956-ffa450edef68
YARN-873. YARNClient.getApplicationReport(unknownAppId) returns a null report (Xuan Gong via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1506732 13f79535-47bb-0310-9956-ffa450edef68
YARN-875. Application can hang if AMRMClientAsync callback thread has exception (Xuan Gong via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1506750 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