HDFS-2576. Fixed some compilation issues. Affects only branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1480151 13f79535-47bb-0310-9956-ffa450edef68
YARN-651. Changed PBClientImpls of ContainerManager and RMAdmin to throw IOExceptions also. Contributed by Xuan Gong.
svn merge --ignore-ancestry -c 1480154 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1480155 13f79535-47bb-0310-9956-ffa450edef68
YARN-582. Changed ResourceManager to recover Application token and client tokens for app attempt so that RM can be restarted while preserving current applications. Contributed by Jian He.
svn merge --ignore-ancestry -c 1480168 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1480169 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-MAPREDUCE-4884-branch-2-gd