Add 'DO ' + 'NOT SUBMIT' checks for buildbot repo
Add 'DO ' + 'NOT SUBMIT' checks for buildbot repo

Change-Id: I0cc4b2e99e12de49b8921af6d471191fe921ac19
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/243483
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Auto-Submit: Ben Wagner aka dogben <3ef7217be91069877d94f7907ce5479000772cd3@google.com>
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot