image_signing: resign_image.sh: drop unused script

This script hasn't been executed by image_signing or the cros-signer
code, and cs/ doesn't turn up any hits.  Scrub it from the codebase.

BRANCH=None
BUG=chromium:714598
TEST=signing images still works

Change-Id: Ief4256a8ceab753d5c1fd6d0f3d81609e11f62a9
Reviewed-on: https://chromium-review.googlesource.com/500329
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: David Riley <davidriley@chromium.org>
1 file changed