[FrameworkBundle] Removing the "namespace" key when it's defined in its own weird location in XML. This prevents that key, which we move in this same location, from looking like an invalid option during validation.

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php

@@ -195,6 +195,7 @@ class Configuration
                     ->ifTrue(function($v) { return is_array($v) && !empty($v['annotations']) && !empty($v['namespace']); })
                     ->then(function($v){
                         $v['annotations'] = array('namespace' => $v['namespace']);
+                        unset($v['namespace']);
                         return $v;
                     })
                     ->end()