admin: implement jtag command

admin/main.go

@@ -17,6 +17,7 @@ var (
 
 	commands = map[string]CommandFunc{
 		"echo": cmd_echo,
+		"jtag": cmd_jtag,
 		"buzzer": cmd_buzzer,
 		"led": cmd_led,
 		"reset": cmd_reset,
@@ -64,6 +65,10 @@ func cmd_echo(tbm *TBM, args []string) error {
 	return cmd_generic(tbm, "echo", args, nil);
 }
 
+func cmd_jtag(tbm *TBM, args []string) error {
+	return cmd_generic(tbm, "jtag", args, nil)
+}
+
 func cmd_buzzer(tbm *TBM, args []string) error {
 	return cmd_generic(tbm, "buzzer", args, nil)
 }