sms: Show the amount of failures and the SMS we want to send.

Improve the debugging possibilities and print the failed attempts
and the sms that was attempted to be delivered. this should help
with debugging the code.
diff --git a/openbsc/src/sms_queue.c b/openbsc/src/sms_queue.c
index fe6eb31..7d5bb38 100644
--- a/openbsc/src/sms_queue.c
+++ b/openbsc/src/sms_queue.c
@@ -442,8 +442,9 @@
 		smsq->max_pending, smsq->pending, VTY_NEWLINE);
 
 	llist_for_each_entry(pending, &smsq->pending_sms, entry)
-		vty_out(vty, " SMS Pending for Subscriber: %llu%s",
-			pending->subscr->id, VTY_NEWLINE);
+		vty_out(vty, " SMS Pending for Subscriber: %llu SMS: %llu Failed: %d.%s",
+			pending->subscr->id, pending->sms_id,
+			pending->failed_attempts, VTY_NEWLINE);
 	return 0;
 }