Make Doctrine's dependency injection test less fragile.

[Doctrine][DependencyInjection] The test checks that a few items are ordered according to the value of their 'priority' attribute. However, a few of the items have the same value of this attribute. RegisterEventListenersAndSubscribersPass doesn't use a stable sorting, yet the test asserts that items that are 'equal' shall go in the original order. Modified so that the order of the original items is not checked.

src/Symfony/Bridge/Doctrine/Tests/DependencyInjection/CompilerPass/RegisterEventListenersAndSubscribersPassTest.php

@@ -139,7 +139,11 @@ public function testProcessEventSubscribersWithPriorities()
         ;
 
         $this->process($container);
-        $this->assertEquals(array('c', 'd', 'e', 'b', 'a'), $this->getServiceOrder($container, 'addEventSubscriber'));
+        $serviceOrder = $this->getServiceOrder($container, 'addEventSubscriber');
+        $unordered = array_splice($serviceOrder, 0, 3);
+        sort($unordered);
+        $this->assertEquals(array('c', 'd', 'e'), $unordered);
+        $this->assertEquals(array('b', 'a'), $serviceOrder);
     }
 
     private function process(ContainerBuilder $container)