minor #14665 [HttpKernel] trigger a deprecation warning when using the ContainerAwareHttpKernel (xabbuh)

This PR was merged into the 2.7 branch.

Discussion
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[HttpKernel] trigger a deprecation warning when using the ContainerAwareHttpKernel

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #13280
| License       | MIT
| Doc PR        |

I agree that we should not trigger the deprecation warning when the `ContainerAwareHttpKernel` is used in the framework code. However, developers using this class in their own code should receive a warning to be able to prepare their applications for Symfony 3.0.

Commits
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030731a [HttpKernel] trigger a deprecation warning when using the ContainerAwareHttpKernel

src/Symfony/Bundle/FrameworkBundle/Resources/config/services.xml

@@ -25,6 +25,7 @@
             <argument type="service" id="service_container" />
             <argument type="service" id="controller_resolver" />
             <argument type="service" id="request_stack" />
+            <argument>false</argument>
         </service>
 
         <service id="request_stack" class="%request_stack.class%" />

src/Symfony/Component/HttpKernel/DependencyInjection/ContainerAwareHttpKernel.php

@@ -39,11 +39,16 @@ class ContainerAwareHttpKernel extends HttpKernel
      * @param ContainerInterface          $container          A ContainerInterface instance
      * @param ControllerResolverInterface $controllerResolver A ControllerResolverInterface instance
      * @param RequestStack                $requestStack       A stack for master/sub requests
+     * @param bool                        $triggerDeprecation Whether or not to trigger the deprecation warning for the ContainerAwareHttpKernel
      */
-    public function __construct(EventDispatcherInterface $dispatcher, ContainerInterface $container, ControllerResolverInterface $controllerResolver, RequestStack $requestStack = null)
+    public function __construct(EventDispatcherInterface $dispatcher, ContainerInterface $container, ControllerResolverInterface $controllerResolver, RequestStack $requestStack = null, $triggerDeprecation = true)
     {
         parent::__construct($dispatcher, $controllerResolver, $requestStack);
 
+        if ($triggerDeprecation) {
+            trigger_error('The '.__CLASS__.' class is deprecated since version 2.7 and will be removed in 3.0. Use the Symfony\Component\HttpKernel\HttpKernel class instead.', E_USER_DEPRECATED);
+        }
+
         $this->container = $container;
 
         // the request scope might have been created before (see FrameworkBundle)

src/Symfony/Component/HttpKernel/Tests/DependencyInjection/ContainerAwareHttpKernelTest.php

@@ -18,6 +18,9 @@ use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 
+/**
+ * @group legacy
+ */
 class ContainerAwareHttpKernelTest extends \PHPUnit_Framework_TestCase
 {
     /**