PRESUBMIT: check OWNERS & METADATA files

BUG=None
TEST=CQ passes

Change-Id: Ifeff4f2902be3d89220346780c2e721d88d2159d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/5684916
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Commit-Queue: Raul Rangel <rrangel@chromium.org>
8 files changed