The RF testbed has hosts behind a one-way firewall, so the
conventional "image_to_live" script does not work. My initial
attempt at solving this, 'cros_copy_upgrade_server', while
sometimes functional, was always quite brittle since it had
widely ranging dependencies which often changed in ways that
the authors could not predict would break our setup.
I've written from scratch a new script in python which uses
ssh tunnels to get around the problem of the firewall issue.
It also has retlatively minimal dependencies (stateful_update,
cros_generate_update_paylod, cgpt, get_latest_image.sh and
the testing keys) so hopefully it won't get blown away too
often.
BUG=none
TEST=Ran under chroot -- Need help testing
Review URL: http://codereview.chromium.org/3391008
