lualoader: Provide a 'menu' command to redraw the menu at the loader prompt

Reported by:	allanjude
Approved by:	re (kib)

stand/lua/menu.lua

@@ -29,7 +29,7 @@
 -- $FreeBSD$
 --
 
-
+local cli = require("cli")
 local core = require("core")
 local color = require("color")
 local config = require("config")
@@ -466,4 +466,9 @@ function menu.autoboot(delay)
 	cli_execute_unparsed(cmd)
 end
 
+-- CLI commands
+function cli.menu(...)
+	menu.run()
+end
+
 return menu