HDFS-5941. add dfs.namenode.secondary.https-address and dfs.namenode.secondary.https-address in hdfs-default.xml. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1568019 13f79535-47bb-0310-9956-ffa450edef68