Merge branch '4.4' into 5.0

* 4.4:
  [Routing] fix tests
  [Form] group constraints when calling the validator
  Remove wrong @group legacy annotations
  [DependencyInjection] Fix dumping multiple deprecated aliases
  allow button names to start with uppercase letter
  States that the HttpClient provides a Http Async implementation

Author: nicolas-grekas

Tests/Authentication/Provider/DaoAuthenticationProviderTest.php

@@ -23,9 +23,6 @@
 
 class DaoAuthenticationProviderTest extends TestCase
 {
-    /**
-     * @group legacy
-     */
     public function testRetrieveUserWhenProviderDoesNotReturnAnUserInterface()
     {
         $this->expectException('Symfony\Component\Security\Core\Exception\AuthenticationServiceException');

Tests/Authentication/Provider/UserAuthenticationProviderTest.php

@@ -61,9 +61,6 @@ public function testAuthenticateWhenUsernameIsNotFoundAndHideIsTrue()
         $provider->authenticate($this->getSupportedToken());
     }
 
-    /**
-     * @group legacy
-     */
     public function testAuthenticateWhenProviderDoesNotReturnAnUserInterface()
     {
         $this->expectException('Symfony\Component\Security\Core\Exception\AuthenticationServiceException');