Download, exec bootstrap script if reset pressed

If the factory reset button is held down, do not continue with the
regular boot process. Instead, turn on the red LED, run DHCP, download
and execute gfrg2xx-recover/bootstrap. This allows us to recover boxes
that would not boot Linux for whatever reason.

Change-Id: Ieaeff42c812cc230234b9a5ab2877645d6449616
2 files changed