Merge branch '3.4' into 4.0

* 3.4:
  do not mock the session in token storage tests
  [DependencyInjection] resolve array env vars
  Add Occitan plural rule
  Fix security/* cross-dependencies
  [Lock] Skip test if posix extension is not installed
  [DI] Allow defining bindings on ChildDefinition
  use strict compare in url validator
  Disallow illegal characters like "." in session.name
  [HttpKernel] do file_exists() check instead of silent notice
  fix rounding from string

Author: fabpot

PluralizationRules.php

@@ -107,6 +107,7 @@ public static function get($number, $locale)
             case 'nl':
             case 'nn':
             case 'no':
+            case 'oc':
             case 'om':
             case 'or':
             case 'pa':