Merge branch '3.4' into 4.2

* 3.4:
  fixed CS
  [Debug][DebugClassLoader] Include found files instead of requiring them

Author: fabpot

Tests/DependencyInjection/FrameworkExtensionTest.php

@@ -24,7 +24,6 @@
 use Symfony\Component\Cache\Adapter\FilesystemAdapter;
 use Symfony\Component\Cache\Adapter\ProxyAdapter;
 use Symfony\Component\Cache\Adapter\RedisAdapter;
-use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
 use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\Compiler\ResolveInstanceofConditionalsPass;