YARN-1685. Fixed few bugs related to handling of containers' log-URLs on ResourceManager and history-service. Contributed by Zhijie Shen.
svn merge --ignore-ancestry -c 1578602 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.4@1578605 13f79535-47bb-0310-9956-ffa450edef68