cft: add build-all option

Will build all registered builds, with the specification given

BUG=None
TEST=./build-dockerimages.py <args> --build_all and verified
builds/output metadata

Change-Id: Ie448bcb1f2570a40410bbca5cf54a5845619ce4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3636778
Commit-Queue: Jaques Clapauch <jaquesc@google.com>
Auto-Submit: Derek Beckett <dbeckett@chromium.org>
Reviewed-by: Jaques Clapauch <jaquesc@google.com>
Tested-by: Derek Beckett <dbeckett@chromium.org>
2 files changed