Merge branch '3.4' into 4.1

* 3.4:
  Fix CS
  Allow reuse of Session between requests
  [MonologBridge] Re-add option option to ignore empty context and extra data
  [Lock] remove useless code
  [PhpUnitBridge] fix disabling DeprecationErrorHandler using phpunit.xml file
  Provide debug_backtrace with proper args
  [DI] fix infinite loop involving self-references in decorated services
  forward false label option to nested types
  forward the invalid_message option in date types

Author: nicolas-grekas

Tests/DependencyInjection/CompleteConfigurationTest.php

@@ -159,8 +159,8 @@ public function testFirewalls()
                 null,
                 null,
                 array(
-                  'simple_form',
-                  'anonymous',
+                    'simple_form',
+                    'anonymous',
                 ),
                 null,
             ),