Fix expression language in the container when using the "container" variable
Merge branch '2.4' into 2.5

* 2.4:
  Make Doctrine's dependency injection test less fragile.
  [Finder] [Iterator] Make the tests less fragile
  [Form][DateTime] Propagate invalid_message & invalid_message parameters to date & time sub widgets
  Fix expression language in the container when using the "container" variable