pre-upload: Exclude top-level OWNERS files from license check

BUG=chromium:936046
TEST=pre-upload_unittest.py

Change-Id: I0417aa078adac1527cc90e83166e74131d2d97c7
Reviewed-on: https://chromium-review.googlesource.com/1584025
Commit-Ready: Chris McDonald <cjmcdonald@chromium.org>
Tested-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
2 files changed