speed up the first boot time

Angstrom systemd-gnome-image was very slow at the first boot.
I indeed remove the post installation process script from rcS.d/S98postinst
then the first boot to console is fast.

then manually run opkg-cl configure at command line.
it takes half an hours or more, you can use gdm to start gnome desktop windows.

angstrom first boot configuration needs to be modified somehow.