HDFS-4858. HDFS DataNode to NameNode RPC should timeout. Contributed by Henry Wang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1567535 13f79535-47bb-0310-9956-ffa450edef68
Fix YARN-1697 in CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1567553 13f79535-47bb-0310-9956-ffa450edef68