HDFS-6823. dfs.web.authentication.kerberos.principal shows up in logs for insecure HDFS

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1616845 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6823. dfs.web.authentication.kerberos.principal shows up in logs for insecure HDFS

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1616846 13f79535-47bb-0310-9956-ffa450edef68