HDFS-5073. Merging r1543303 from trunk to branch-2

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1543304 13f79535-47bb-0310-9956-ffa450edef68
YARN-1210. Changed RM to start new app-attempts on RM restart only after ensuring that previous AM exited or after expiry time. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1543310 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1543311 13f79535-47bb-0310-9956-ffa450edef68
YARN-674. Fixed ResourceManager to renew DelegationTokens on submission asynchronously to work around potential slowness in state-store. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1543312 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1543313 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5428. Merge change r1543329 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1543332 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10107. Merge change r1543335 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1543338 13f79535-47bb-0310-9956-ffa450edef68
YARN-584. In scheduler web UIs, queues unexpand on refresh. (Harshit Daga via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1543352 13f79535-47bb-0310-9956-ffa450edef68