title: mongos error "mirrored config server connections are not supported"
body: <p>Is something wrong with this?</p>
  
  <pre><code>  $ sudo mongos --logpath "mongos-1.log" --configdb localhost:57040,localhost:57041,localhost:57042 --fork
      FailedToParse: mirrored config server connections are not supported; for config server replica sets be sure to use the replica set connection string
      try 'mongos --help' for more information
  </code></pre>