vNext - explicitly create the transaction on registration

kamailio/registrar-role.cfg

@@ -148,6 +148,10 @@ route[KAZOO_AUTHORIZATION]
     $var(amqp_payload_request) = '{"Event-Category" : "directory" , "Event-Name" : "authn_req", "Method" : "REGISTER", "Auth-Nonce" : "$adn", "Auth-Realm" : "$fd", "Auth-User" : "$fU", "From" : "$fu", "To" : "$tu" }';
     $var(amqp_routing_key) = "authn.req." + $(fd{kz.encode});
     $avp(kz_timeout) = 2500;
+    if (!t_newtran()) {
+        sl_reply_error();
+        exit();
+    }
     if(kazoo_async_query("callmgr", $var(amqp_routing_key), $var(amqp_payload_request), "KAZOO_AUTHORIZATION_OK", "KAZOO_AUTHORIZATION_ERROR") != 1) {
         xlog("L_INFO", "$ci|log|failed to send Kazoo query for authentication credentials for $Au $si:$sp");
         append_to_reply("Retry-After: 60\r\n");