Merge branch '3.4' into 4.3

* 3.4:
  [Config] Disable default alphabet sorting in glob function due of unstable sort
  [Serializer] Improve messages for unexpected resources values
  [SecurityBundle] correct types for default arguments for firewall configs

Author: nicolas-grekas

Finder.php

@@ -595,7 +595,8 @@ public function in($dirs)
         foreach ((array) $dirs as $dir) {
             if (is_dir($dir)) {
                 $resolvedDirs[] = $this->normalizeDir($dir);
-            } elseif ($glob = glob($dir, (\defined('GLOB_BRACE') ? GLOB_BRACE : 0) | GLOB_ONLYDIR)) {
+            } elseif ($glob = glob($dir, (\defined('GLOB_BRACE') ? GLOB_BRACE : 0) | GLOB_ONLYDIR | GLOB_NOSORT)) {
+                sort($glob);
                 $resolvedDirs = array_merge($resolvedDirs, array_map([$this, 'normalizeDir'], $glob));
             } else {
                 throw new DirectoryNotFoundException(sprintf('The "%s" directory does not exist.', $dir));