f20 - adding dep ignore list & untar off-docker

Image size before: 5.7, after: 4.03

BUG=b:200970609
TEST=./build_dockerimage & run_docker with a test that previously used
this dep.

Change-Id: I5bd123109170088427fb6ba438a79959992a6802
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3179315
Tested-by: Derek Beckett <dbeckett@chromium.org>
Auto-Submit: Derek Beckett <dbeckett@chromium.org>
Reviewed-by: Sean McAllister <smcallis@google.com>
2 files changed