Merge branch '2.8' into 3.1

* 2.8:
  [FrameworkBundle] Check for class existence before is_subclass_of
  Update GroupSequence.php
  Code enhancement and cleanup
  [Form] Fix transformer tests after the ICU update
  [DI] Add anti-regression test
  Revert "minor #19689 [DI] Cleanup array_key_exists (ro0NL)"
  bumped Symfony version to 2.8.11
  updated VERSION for 2.8.10
  updated CHANGELOG for 2.8.10
  [BrowserKit] Fix cookie expiration on 32 bit systems
  bumped Symfony version to 2.7.18
  updated VERSION for 2.7.17
  update CONTRIBUTORS for 2.7.17
  updated CHANGELOG for 2.7.17
  Update misleading comment about RFC4627

Author: nicolas-grekas

DependencyInjection/LazyLoadingFragmentHandler.php

@@ -42,6 +42,7 @@ public function __construct(ContainerInterface $container, RequestStack $request
     /**
      * Adds a service as a fragment renderer.
      *
+     * @param string $name     The service name
      * @param string $renderer The render service id
      */
     public function addRendererService($name, $renderer)

Profiler/Profiler.php

@@ -78,7 +78,7 @@ public function enable()
      *
      * @param Response $response A Response instance
      *
-     * @return Profile A Profile instance
+     * @return Profile|false A Profile instance
      */
     public function loadProfileFromResponse(Response $response)
     {

Tests/EventListener/ValidateRequestListenerTest.php

@@ -21,7 +21,7 @@
 class ValidateRequestListenerTest extends \PHPUnit_Framework_TestCase
 {
     /**
-     * @expectedException Symfony\Component\HttpFoundation\Exception\ConflictingHeadersException
+     * @expectedException \Symfony\Component\HttpFoundation\Exception\ConflictingHeadersException
      */
     public function testListenerThrowsWhenMasterRequestHasInconsistentClientIps()
     {

Tests/HttpKernelTest.php

@@ -303,7 +303,7 @@ public function testVerifyRequestStackPushPopDuringHandle()
     }
 
     /**
-     * @expectedException Symfony\Component\HttpKernel\Exception\BadRequestHttpException
+     * @expectedException \Symfony\Component\HttpKernel\Exception\BadRequestHttpException
      */
     public function testInconsistentClientIpsOnMasterRequests()
     {

UriSigner.php

@@ -98,7 +98,7 @@ private function buildUrl(array $url, array $params = array())
         $host = isset($url['host']) ? $url['host'] : '';
         $port = isset($url['port']) ? ':'.$url['port'] : '';
         $user = isset($url['user']) ? $url['user'] : '';
-        $pass = isset($url['pass']) ? ':'.$url['pass']  : '';
+        $pass = isset($url['pass']) ? ':'.$url['pass'] : '';
         $pass = ($user || $pass) ? "$pass@" : '';
         $path = isset($url['path']) ? $url['path'] : '';
         $query = isset($url['query']) && $url['query'] ? '?'.$url['query'] : '';