[BP]MB-7497: Remove min_data_age and queue_age_cap

Change-Id: I192ce59267cf304ea3642881ff5ebf8ba9ce543f
Reviewed-on: http://review.couchbase.org/25278
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>