HDFS-5279. Merging change r1528308 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1528310 13f79535-47bb-0310-9956-ffa450edef68
YARN-1260. Added webapp.http.address to yarn-default.xml so that default install with https enabled doesn't have broken link on NM UI. Contributed by Omkar Vinit Joshi.
svn merge --ignore-ancestry -c 1528312 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1528313 13f79535-47bb-0310-9956-ffa450edef68