Set successful connect to true on auth stratum to allow summary on exit from single stratum pool.

util.c

@@ -1311,6 +1311,7 @@ bool auth_stratum(struct pool *pool)
 	ret = true;
 	applog(LOG_INFO, "Stratum authorisation success for pool %d", pool->pool_no);
 	pool->probed = true;
+	successful_connect = true;
 out:
 	if (val)
 		json_decref(val);