cft: remove python2 from cros-test

BUG=None
TEST=./build-dockerimage.sh

Change-Id: I4b7aaff2076e05c37ee3f7c963b2234615316768
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3576662
Tested-by: Derek Beckett <dbeckett@chromium.org>
Auto-Submit: Derek Beckett <dbeckett@chromium.org>
Reviewed-by: Jaques Clapauch <jaquesc@google.com>
Reviewed-by: Seewai Fu <seewaifu@google.com>
Commit-Queue: Seewai Fu <seewaifu@google.com>
2 files changed