add 'bye' command (currently ignored), harmonize errors due to wrong number of arguments

server/commands/command_list.c

@@ -52,6 +52,7 @@ static client_function commands[] = {
 	{ "noop",           noop_func           },
 	{ "info",           info_func           },
 	{ "sleep",          sleep_func          },
+	{ "bye",            bye_func            },
 	{ NULL,             NULL},
 };