title: Redirect (301) one route to another from routing.yml in Symfony2
body: <p>I know this is probably trivial, but I couldn't find anything on the web or in the Symfony2 reference.</p>
  
  <p>How do I redirect one route to another from routing.yml (with 301 status code)?</p>
  
  <p>I'm looking for something like this:</p>
  
  <pre><code>SomeRoute:
      pattern: /someroute
      defaults: { _controller: SomeBundle:Controller:action }
  
  AnotherRoute:
      pattern: /anotherroute
      defaults: { _redirect: {route: SomeRoute, status: 301} }
  </code></pre>
  
  <p>I could create a controller, but it seems overkill, since I don't have any parameters (and it would be overkill even so, if they are to be passed as they are).</p>