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This change also makes the supervision server flags simpler, since we
are getting close to a final server implementation.

Bug: 958995
Change-Id: Ic3c07ef4a992faf6238bbd2a492848d26174a461
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1621010
Commit-Queue: Lucas Tenório <ltenorio@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662196}