Logs the current user out.
\Symfony\Component\HttpFoundation\Request $request: The current request.
\Symfony\Component\HttpFoundation\RedirectResponse A redirection to home page.
public function logout(Request $request) {
user_logout();
// @todo Remove the destination check once drupal.org/node/1668866 is in.
$url = $request->query
->get('destination') ?: '<front>';
return new RedirectResponse(url($url, array(
'absolute' => TRUE,
)));
}