nebraska: Nebraska should honor deadline=now for install operations

Otherwise we cannot really test an install if it happens before all OOBE
screens are passed.

BUG=None
TEST=nebraska_unittests.py

Change-Id: I4eb8f967a73e85dca5d8a369cd1cd99c9e76a353
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/1938011
Tested-by: Amin Hassani <ahassani@chromium.org>
Tested-by: Jae Hoon Kim <kimjae@chromium.org>
Reviewed-by: Jae Hoon Kim <kimjae@chromium.org>
Commit-Queue: Amin Hassani <ahassani@chromium.org>
2 files changed