Merge branch '5.1' into 5.2

* 5.1:
  add missing use statement

src/Symfony/Bundle/FrameworkBundle/Tests/Controller/AbstractControllerTest.php

@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Tests\Controller;
 
+use Doctrine\Persistence\ManagerRegistry;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Bundle\FrameworkBundle\Tests\TestCase;
 use Symfony\Component\DependencyInjection\Container;