merged branch fabriceb/master (PR symfony#9060)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes symfony#9060).

Discussion
----------

[HttpKernel] fixes RequestDataCollector bug, visible on Drupal8

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

In Drupal8 ```$request->attributes->all()``` returns an array with a 0 key whose value is the ```Drupal\user\Entity\User```

```php
array(
 0 => Drupal\user\Entity\User,
 ...
)
```

```('_route' == $key && is_object($value))``` is therefore true which provokes an exception:

```php
FatalErrorException: Error: Call to undefined method Drupal\user\Entity\User::getPath() in [...]/RequestDataCollector.php line 54
```

This patch corrects this with a simple replacement of == by ===

Commits
-------

ba85279 [HttpKernel] fixes RequestDataCollector bug, visible when used on Drupal8

src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php

@@ -50,9 +50,9 @@ public function collect(Request $request, Response $response, \Exception $except
 
         $attributes = array();
         foreach ($request->attributes->all() as $key => $value) {
-            if ('_route' == $key && is_object($value)) {
+            if ('_route' === $key && is_object($value)) {
                 $attributes['_route'] = $this->varToString($value->getPath());
-            } elseif ('_route_params' == $key) {
+            } elseif ('_route_params' === $key) {
                 foreach ($value as $key => $v) {
                     $attributes['_route_params'][$key] = $this->varToString($v);
                 }