image_signing: change files sign_oci_container looks for

Since we're packing containers in a format imageloader understands,
we need to consume imageloader's manifest and produce a signature
it knows to look for.

BRANCH=ToT
BUG=chromium:697645
TEST=package adb container, verify imageloader.sig.2 is present

Change-Id: Ied9cdacf1d448a094c1b171bc2bf3b2ae54eb517
Reviewed-on: https://chromium-review.googlesource.com/457102
Commit-Ready: Eric Caruso <ejcaruso@chromium.org>
Tested-by: Eric Caruso <ejcaruso@chromium.org>
Reviewed-by: Stephen Barber <smbarber@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed