Merge branch '5.0' into 5.1

* 5.0:
  [SecurityBundle] Drop cache.security_expression_language definition if invalid
  [DI] disable preload.php on the CLI
  collect all transformation failures

Author: nicolas-grekas

Dumper/PhpDumper.php

@@ -339,6 +339,10 @@ class %s extends {$options['class']}
 
 use Symfony\Component\DependencyInjection\Dumper\Preloader;
 
+if (in_array(PHP_SAPI, ['cli', 'phpdbg'], true)) {
+    return;
+}
+
 require $autoloadFile;
 require __DIR__.'/$preloadedFiles';