build_image: advertise cros flash over the network

This is a useful option to directly update the OS image on a DUT,
which could use some additional publicity along with its USB stick
counterpart.

BUG=None
TEST=ran script

Change-Id: I3297ecf40534ddf7f2479df8378bcf9e8f9180cf
Signed-off-by: Enrico Granata <egranata@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1662916
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
1 file changed