title: Is possible use prefix or const in a path of the route in symfony
body: <p>I tried to look how i can put a prefix in a path of route.</p>
  
  <pre><code>#routing.yml
  
  app_news:
      path:     /panel/news
      defaults: { _controller: NewsBundle:Default:index }
  </code></pre>
  
  <p>I have some routes like this, if i want change in the future the name of the path, for example </p>
  
  <p><strong>/admin/news</strong> or <strong>/control/news</strong></p>
  
  <p>Can i save the prefix in other config yml file and change it when i want?</p>