Issue in configuration tree, the validation for the parameter param_fetch_listener is set

in the `cache_dir` parameter.

Issue #513

Author: aferrandini

DependencyInjection/Configuration.php

@@ -45,13 +45,13 @@ public function getConfigTreeBuilder()
                     ->useAttributeAsKey('name')
                     ->prototype('boolean')->end()
                 ->end()
-                ->scalarNode('param_fetcher_listener')->defaultFalse()->end()
-                ->scalarNode('cache_dir')->cannotBeEmpty()->defaultValue('%kernel.cache_dir%/fos_rest')
+                ->scalarNode('param_fetcher_listener')->defaultFalse()
                     ->validate()
                         ->ifNotInArray($this->forceOptionValues)
                         ->thenInvalid('The param_fetcher_listener option does not support %s. Please choose one of '.json_encode($this->forceOptionValues))
                     ->end()
                 ->end()
+                ->scalarNode('cache_dir')->cannotBeEmpty()->defaultValue('%kernel.cache_dir%/fos_rest')->end()
                 ->scalarNode('allowed_methods_listener')->defaultFalse()->end()
                 ->arrayNode('routing_loader')
                     ->addDefaultsIfNotSet()