Merge branch '4.1'

* 4.1:
  Supress deprecation notices thrown when getting private servies from container in tests
  Uses `protected` for test functions
  [Messenger] Allow to scope handlers per bus
  do not mock the session in token storage tests
  [DependencyInjection] resolve array env vars
  Add Occitan plural rule
  Fix security/* cross-dependencies
  [Messenger] implement several senders using a ChainSender
  [Lock] Skip test if posix extension is not installed
  fix bug when imported routes are prefixed
  [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
  Select alternatives on missing receiver arg or typo
  fix rounding from string

Author: fabpot

Tests/Store/BlockingStoreTestTrait.php

@@ -31,6 +31,7 @@ abstract protected function getStore();
      * This test is time sensible: the $clockDelay could be adjust.
      *
      * @requires extension pcntl
+     * @requires extension posix
      * @requires function pcntl_sigwaitinfo
      */
     public function testBlockingLocks()