[oe] autologin recipe for gumstix Overo

[Ash Charles]

Hi Elvis,

Does the image do the autologin the second time you boot it?

I wrote the autologin stuff to do some factory testing of new boards
but discovered after some head scratching that the image only did the
automatic login after the first reboot; I wondered if perhaps the
postinst stuff was only getting run after the image was booted.

For the testing stuff, I ended up just booting once and then cloning
this once-booted test image.

-Ash