Merge branch '4.3' into 4.4

* 4.3:
  [FrameworkBundle] Fixed suggested package for missing server:dump command
  Add BC break note to UPGRADE-4.2.md

Author: nicolas-grekas

EventListener/SuggestMissingPackageSubscriber.php

@@ -39,7 +39,7 @@ final class SuggestMissingPackageSubscriber implements EventSubscriberInterface
             '_default' => ['MakerBundle', 'symfony/maker-bundle --dev'],
         ],
         'server' => [
-            'dump' => ['VarDumper Component', 'symfony/var-dumper --dev'],
+            'dump' => ['Debug Bundle', 'symfony/debug-bundle --dev'],
             '_default' => ['WebServerBundle', 'symfony/web-server-bundle --dev'],
         ],
     ];