Merge branch '2.8' into 3.4

* 2.8:
  improve docblocks around group sequences
  [WebProfilerBundle] added a note in the README
  [Filesystem] Skip tests on readable file when run with root user
  [FWBundle] Fix an error in WebTestCase::createClient's PHPDoc
  [HttpFoundation][Security] forward locale and format to subrequests
  [Console] Send the right exit code to console.terminate listeners
  Caching missed templates on cache warmup

Author: fabpot

HttpUtils.php

@@ -91,6 +91,13 @@ public function createRequest(Request $request, $path)
             $newRequest->attributes->set(Security::LAST_USERNAME, $request->attributes->get(Security::LAST_USERNAME));
         }
 
+        if ($request->get('_format')) {
+            $newRequest->attributes->set('_format', $request->get('_format'));
+        }
+        if ($request->getDefaultLocale() !== $request->getLocale()) {
+            $newRequest->setLocale($request->getLocale());
+        }
+
         return $newRequest;
     }