sign_official_build: dump more info in resign_android_image_if_exists
sign_official_build: dump more info in resign_android_image_if_exists

We're getting silent errors in here somewhere.

BRANCH=none
BUG=chromium:1141907
TEST=none

Change-Id: I9af0a3ea1696920fe67c915660f82a68c1bddf34
Signed-off-by: Brian Norris <67059238af8e1945c40edb274ce1d51ba595dbf3@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2504358
Reviewed-by: LaMont Jones <01939f9990a33aa2509cfaed21d2f9ba201a2b37@chromium.org>
Commit-Queue: LaMont Jones <01939f9990a33aa2509cfaed21d2f9ba201a2b37@chromium.org>
Tested-by: LaMont Jones <01939f9990a33aa2509cfaed21d2f9ba201a2b37@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot