This extends the existing downgrade for comments on WIP changes and
makes our "is bot" logic more strict (must have tag with prefix of
"autogenerated:"). The new default notify levels for comments by bots
are now:
WIP changes: OWNER
Ready for review changes: OWNER_REVIEWERS
The default notify levels for all other comments reamin the same:
WIP changes where review has never started: OWNER
WIP changes where review has started: ALL
Ready for review changes: ALL
Change-Id: I0a30a43065be1e00f53ac25d937141dc4ea1e8f2
2f08e0776e