[FrameworkBundle] Add missing useAttributeAsKey calls

Author: MatTheCat

DependencyInjection/Configuration.php

@@ -1857,6 +1857,7 @@ private function addHttpClientSection(ArrayNodeDefinition $rootNode, callable $e
                                 ->end()
                                 ->arrayNode('vars')
                                     ->info('Associative array: the default vars used to expand the templated URI.')
+                                    ->useAttributeAsKey('name')
                                     ->normalizeKeys(false)
                                     ->variablePrototype()->end()
                                 ->end()
@@ -1937,6 +1938,7 @@ private function addHttpClientSection(ArrayNodeDefinition $rootNode, callable $e
                                 ->end()
                                 ->arrayNode('extra')
                                     ->info('Extra options for specific HTTP client')
+                                    ->useAttributeAsKey('name')
                                     ->normalizeKeys(false)
                                     ->variablePrototype()->end()
                                 ->end()
@@ -2088,6 +2090,7 @@ private function addHttpClientSection(ArrayNodeDefinition $rootNode, callable $e
                                     ->end()
                                     ->arrayNode('extra')
                                         ->info('Extra options for specific HTTP client')
+                                        ->useAttributeAsKey('name')
                                         ->normalizeKeys(false)
                                         ->variablePrototype()->end()
                                     ->end()