Revert "feature #1082 DefaultController extends the new AbstractController (vudaltsov)"

This reverts commit 2e8d74c, reversing
changes made to fc93b84.

Author: fabpot

src/AppBundle/Controller/DefaultController.php

@@ -3,10 +3,10 @@
 namespace AppBundle\Controller;
 
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
-use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Bundle\FrameworkBundle\Controller\Controller;
 use Symfony\Component\HttpFoundation\Request;
 
-class DefaultController extends AbstractController
+class DefaultController extends Controller
 {
     /**
      * @Route("/", name="homepage")