Use request format from request in twig ExceptionController
Merge branch '2.3' into 2.4

* 2.3:
  remove obsolete test file
  [FrameworkBundle] output failed matched path for clarification
  bug #10242 Missing checkPreAuth from RememberMeAuthenticationProvider
  [Validator] Fixed StaticMethodLoaderTest to actually test something
  [Form] Fixed ValidatorTypeGuesser to guess properties without constraints not to be required
  Use request format from request in twig ExceptionController
  [Form] Moved POST_MAX_SIZE validation from FormValidator to request handler
  [Form] Add a form error if post_max_size has been reached.
  Response::isNotModified returns true when If-Modified-Since is later than Last-Modified
  [WebProfilerBundle] turbolinks compatibility

Conflicts:
	src/Symfony/Component/Form/CHANGELOG.md
	src/Symfony/Component/HttpFoundation/Tests/ResponseTest.php
	src/Symfony/Component/Security/Core/Tests/Authentication/Provider/RememberMeAuthenticationProviderTest.php