forgot to properly prompt for the slave servers (priority = low)

debian/alternc.config

@@ -164,6 +164,7 @@ db_input low alternc/mysql/client || true
 db_input low alternc/sql/backup_type || true
 db_input low alternc/sql/overwrite || true
 db_input low alternc/monitor_ip || true
+db_input low alternc/slaves || true
 db_go
 
 # vim: et sw=4