futility: show vs verify

This adds a --strict mode to the show command, which requires
that all signatures be valid in order to exit cleanly. It also
creates a "verify" command, which is really just an alias for
"show --strict".

TEST=make runtests

Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Change-Id: I1fed7db7fe7128191bcab0c615706ef4fe2709f5
Reviewed-on: https://chromium-review.googlesource.com/219732
Reviewed-by: Randall Spangler <rspangler@chromium.org>
6 files changed