Overrides and eliminates this method from the parent class. Do not use.
This method is part of the KernelInterface interface, but takes an object implementing LoaderInterface as its only parameter. This is part of the Config compoment from Symfony, which is not provided by Drupal core.
Modules wishing to provide an extension to this class which uses this method are responsible for ensuring the Config component exists.
Overrides KernelInterface::registerContainerConfiguration
public function registerContainerConfiguration(LoaderInterface $loader) {
}