nebraska: Add flag to ignore appid.

Add a flag to ignore the request's appid. We need this for
autoupdate_StatefulCompatibility, which updates between <board> and
<board>-kernelnext which have mismatching app IDs.

BUG=b:168074829
TEST=./nebraska_unittests.py
TEST=autoupdate_StatefulCompatibility with the changes in place to pass
the new flag through.

Change-Id: I227dc8933d99a8bdef8534f92d8341fc9eff618a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2541673
Tested-by: Kyle Shimabukuro <kyleshima@chromium.org>
Reviewed-by: Jae Hoon Kim <kimjae@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
Commit-Queue: Kyle Shimabukuro <kyleshima@chromium.org>
2 files changed