YARN-410. Fixed RM UI so that the new lines diagnostics for a failed app on the per-application page are translated to html line breaks. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1451808 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1451809 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-HADOOP-9016-branch-2-gd