gsm_04_80: Allow to specify the alert pattern for the notification

Allow to specify the level (not the category) of the notification
this provides an easy way to test it on the phones.
diff --git a/openbsc/src/vty_interface_layer3.c b/openbsc/src/vty_interface_layer3.c
index b775af1..55fe1c0 100644
--- a/openbsc/src/vty_interface_layer3.c
+++ b/openbsc/src/vty_interface_layer3.c
@@ -375,9 +375,10 @@
 
 DEFUN(subscriber_ussd_notify,
       subscriber_ussd_notify_cmd,
-      "subscriber " SUBSCR_TYPES " ID ussd-notify .TEXT",
+      "subscriber " SUBSCR_TYPES " ID ussd-notify (0|1|2) .TEXT",
       SUBSCR_HELP "USSD Notify\n"
       "Subscriber ID\n"
+      "Alerting Level\n"
       "Text Message to send\n")
 {
 	char *text;
@@ -385,6 +386,7 @@
 	struct gsm_network *gsmnet = gsmnet_from_vty(vty);
 	struct gsm_subscriber *subscr = get_subscr_by_argv(gsmnet, argv[0], argv[1]);
 	int rc;
+	int level;
 
 	if (!subscr) {
 		vty_out(vty, "%% No subscriber found for %s %s%s",
@@ -392,7 +394,8 @@
 		return CMD_WARNING;
 	}
 
-	text = argv_concat(argv, argc, 2);
+	level = atoi(argv[2]);
+	text = argv_concat(argv, argc, 3);
 	if (!text) {
 		subscr_put(subscr);
 		return CMD_WARNING;
@@ -407,7 +410,7 @@
 		return CMD_WARNING;
 	}
 
-	gsm0480_send_ussdNotify(conn, text);
+	gsm0480_send_ussdNotify(conn, level, text);
 	gsm0480_send_releaseComplete(conn);
 
 	subscr_put(subscr);