mod_pubsub_serverinfo: Warm-up opt-in cache By warming up the cache that contains the opt-in data, the first publication has a better chance of including domain names for remote domains that opt-in. Without this change, those domains are named only after the _second_ publication, which can take a while. New users are likely thrown off by that.

module:hook("authentication-success", function (event)
	local session = event.session;
	local sasl_handler = session and session.sasl_handler;
	local log = session and session.log or module._log
	log("info", "Authenticated with %s", sasl_handler and sasl_handler.selected or "legacy auth");
end);