HADOOP-10602. Merging change r1598337 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1598338 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10602. Merging change r1598339 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1598340 13f79535-47bb-0310-9956-ffa450edef68
YARN-2112. Fixed yarn-common's pom.xml to include jackson dependencies so that both Timeline Server and client can access them. Contributed by Zhijie Shen.
svn merge --ignore-ancestry -c 1598373 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1598374 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6461. Use Time#monotonicNow to compute duration in DataNode#shutDown. Contributed by James Thomas.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1598400 13f79535-47bb-0310-9956-ffa450edef68