xbuddy: Fix linter errors.

Also replace mox

BUG=chromium:403086
TEST=unittests, cros flash

Change-Id: I6052be6b45f1c480732925bf490ff5ecf38e39ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/1822077
Tested-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Achuith Bhandarkar <achuith@chromium.org>
2 files changed