cros-test - add python bindings into container

There is a minor risk with the chroot being 3.6 and the container being
3.8. In another CL I might look into downgrading the exec container back
  to 3.6 to keep in lockstep with the chroot.

BUG=b:244371752
TEST=cq/local build

Change-Id: If1864ed4a2775f5e2895831b820a69aaefc21e4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3867538
Reviewed-by: Jaques Clapauch <jaquesc@google.com>
Commit-Queue: Derek Beckett <dbeckett@chromium.org>
Tested-by: Derek Beckett <dbeckett@chromium.org>
3 files changed