YARN-621. Changed YARN web app to not add paths that can cause duplicate additions of authenticated filters there by causing kerberos replay errors. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1529030 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1529031 13f79535-47bb-0310-9956-ffa450edef68