Config directory not created after install if settings.php exists before install

You can install without hitting install_settings_form_submit() if your settings.php already has the db stuff in it, and right now in that case your config directory never gets created. This results in config files being created in sites/default/files.

Current thinking would be to make the installer bail out with an error if you have a settings.php already but it doesn't contain a $config_file_directory.