title: running knife gives me double @ at the address part
body: <p>I don't know what is wrong with my settting:</p>
  
  <pre><code>siegfried@ubuntu:~/chef-repo$ knife ssh -a ipaddress 'name:chefnode' 'uptime'        
  
  WARNING: Failed to connect to  -- Net::SSH::AuthenticationFailed: Authentication       failed for user siegfried@192.168.1.73@192.168.1.73
  
  failed for user siegfried@192.168.1.73@192.168.1.73
  </code></pre>
  
  <p>There is a double <code>@</code> in it. I totally have no idea how to fix it.</p>