YARN-1505. Fixed Webapplication proxy server to not hardcode its bind address. Contributed by Xuan Gong.
svn merge --ignore-ancestry -c 1551314 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1551315 13f79535-47bb-0310-9956-ffa450edef68