[unibuild] Fix issues with model specific fw sign

Updated the current coral config to use the fake keys from the loemkeys
dev keyset (ACME) and then tested/debugged this flow based on that
config.

Fixed issue where key_id wasn't eval'd in bash when it was passed to
grep because it has ' quotes around it.

BUG=b:64842314
TEST=~/trunk/src/platform/vboot_reference/scripts/image_signing/sign_official_build.sh
recovery
../build/images/coral/R62-9877.0.2017_08_25_1030-a1/recovery_image.bin
../platform/vboot_reference/tests/loemkeys
coral_loem_signed_recovery.bin
BRANCH=None

Change-Id: I50a58e512e9a83dc2707951f12d709f9006d67ca
Reviewed-on: https://chromium-review.googlesource.com/636344
Commit-Ready: C Shapiro <shapiroc@google.com>
Tested-by: C Shapiro <shapiroc@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed