Adjust WATCHLISTS for vabr@
Adjust WATCHLISTS for vabr@

The following changes for vabr:

* Improve e-mail tags for better watchlist message filtering.
* Watch directories where vabr recently became an owner.
* Stop watching directories which are no longer interesting to vabr.

R=mkwst@chromium.org

Review URL: https://codereview.chromium.org/1415463023

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#358875}

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