mod_turncredentials: Add 'transport' attribute XEP-0215 recommends using 'transport' attribute and since coturn can work in both TCP and UPD modes this patch adds one <service> element for each combination of STUN/TURN and TCP/UDP.

module:hook("message/host", function (event)
	local stanza = event.stanza;
	if #stanza.tags == 1 and stanza.tags[1].attr.xmlns == "http://jabber.org/protocol/chatstates" then
		return true;
	end
end, -10);