YARN-170. NodeManager stop() gets called twice on shutdown (Sandy Ryza via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1432965 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9181. Set daemon flag for HttpServer's QueuedThreadPool (Liang Xie via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1432972 13f79535-47bb-0310-9956-ffa450edef68