[FrameworkBundle] added configuration interface check

Added check for ConfigurationInterface to config ref dumping
command. To ensure that configuration implements needed
`getConfigTreeBuilder()` command

src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php

@@ -17,6 +17,7 @@
 use Symfony\Component\Config\Definition\NodeInterface;
 use Symfony\Component\Config\Definition\ArrayNode;
 use Symfony\Component\Config\Definition\PrototypedArrayNode;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 
 /**
  * A console command for dumping available configuration reference
@@ -102,6 +103,12 @@ protected function execute(InputInterface $input, OutputInterface $output)
                     '" does not have it\'s getConfiguration() method setup');
         }
 
+        if (!$configuration instanceof ConfigurationInterface) {
+            throw new \LogicException(
+                'Configuration class "'.get_class($configuration).
+                '" should implement ConfigurationInterface in order to be dumpable');
+        }
+
         $rootNode = $configuration->getConfigTreeBuilder()->buildTree();
 
         $output->writeln($message);