Modified setup for aif

Added a script to overlay which call aif's interactiv procedure when
/arch/setup is started. Also removed old arch-installer from
packages.list
Signed-off-by: Gerhard Brauer <gerbra@archlinux.de>
Signed-off-by: Aaron Griffin <aaronmgriffin@gmail.com>

configs/install-iso/overlay/arch/setup

+#!/bin/sh
+#
+aif -p interactive

configs/install-iso/packages.list

-archlinux-installer
 aif
 aufs2-util
 base