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.

-- this module is deprecated, log an error and load the superseding module instead
module:depends"smacks"

module:log("error", "mod_smacks_offline is deprecated! Just use mod_smacks!");