merge -c 1457038 from trunk to branch-2 to fix YARN-196. Nodemanager should be more robust in handling connection failure to ResourceManager when a cluster is started. Contributed by Xuan Gong.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1457041 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4571. TestHsWebServicesJobs fails on jdk7. (tgraves via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1457063 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4716. TestHsWebServicesJobsQuery.testJobsQueryStateInvalid fails with jdk7. (tgraves via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1457068 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1457119 FIXES: MAPREDUCE-5042. Reducer unable to fetch for a map task that was recovered (Jason Lowe via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1457121 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9318. When exiting on a signal, print the signal name first. Contributed by Colin Patrick McCabe.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1457124 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd