title: Controller subdirectories?
body: <p>I would like to isolate some controllers in a subdirectory in my Symfony2 app.
  Something like that:</p>
  
  <pre><code>route:
    resource: "@MyBundle/Controller/Admin/"
    type:     annotation
    prefix:   /admin/
  </code></pre>
  
  <p>In this directory there is 6 controller class.
  I can import these separatly but it's not practical ...</p>
  
  <p>Thanks for your help.</p>