YARN-1481. Addendum patch to fix synchronization in AdminService

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1553738 13f79535-47bb-0310-9956-ffa450edef68
YARN-1541. Changed ResourceManager to invalidate ApplicationMaster host/port information once an AM crashes. Contributed by Jian He.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1553772 13f79535-47bb-0310-9956-ffa450edef68
YARN-1463. Tests should avoid starting http-server where possible or creates spnego keytab/principals (vinodkv via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1553790 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk