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We are busily converting over the test configs for the waterfalls
to the new `generate_buildbot_json` tooling; until everything
is converted, and we have docs written for how to use this,
we want only a very small number of people making changes to
these files.

R=kbr@chromium.org, jbudorick@chromium.org
BUG=662541

Change-Id: I45432632c914a721fc2704e1b57a02399c624a2f
Reviewed-on: https://chromium-review.googlesource.com/809684Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521842}