Run this once on init.

def RunOnce(self):
    """Run this once on init."""
    global WEBAUTH_MANAGER  # pylint: disable=global-statement

    # pylint: disable=g-bad-name
    WEBAUTH_MANAGER = BaseWebAuthManager.GetPlugin(
        config.CONFIG["AdminUI.webauth_manager"])()

    # pylint: enable=g-bad-name
    logging.info("Using webauth manager %s", WEBAUTH_MANAGER)