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When handling updates to existing entries, it is often necessary to know what the previous value was. NetworkDB knows the previous and new values when it broadcasts an update event for an entry. Include both values in the update event so the watchers do not have to do their own parallel bookkeeping. Unify the event types under WatchEvent as representing the operation kind in the type system has been inconvenient, not useful. The operation is now implied by the nilness of the Value and Prev event fields. Signed-off-by: Cory Snider <csnider@mirantis.com>