defaults created for web keytab and principal, these properties should not have 
defaults
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                 Key: HDFS-2368
                 URL: https://issues.apache.org/jira/browse/HDFS-2368
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 0.20.205.0
            Reporter: Arpit Gupta
            Assignee: Tsz Wo (Nicholas), SZE


the following defaults are set in hdfs-defaults.xml

<property>
  <name>dfs.web.authentication.kerberos.principal</name>
  <value>HTTP/${dfs.web.hostname}@${kerberos.realm}</value>
  <description>
    The HTTP Kerberos principal used by Hadoop-Auth in the HTTP endpoint.

    The HTTP Kerberos principal MUST start with 'HTTP/' per Kerberos
    HTTP SPENGO specification.
  </description>
</property>

<property>
  <name>dfs.web.authentication.kerberos.keytab</name>
  <value>${user.home}/dfs.web.keytab</value>
  <description>
    The Kerberos keytab file with the credentials for the
    HTTP Kerberos principal used by Hadoop-Auth in the HTTP endpoint.
  </description>
</property>


These properties should not have defaults

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