Correct the relays to keep after retrieving new consensuses
When removing the old consensus timestamps, the oldest date is calculated with timedelta without passing seconds, which was taking it as days, making the oldest date very far in the past. Recent timestamps are calculated as greater than the oldest date, instead of minor, what would make to store many timestamps. The most recent timestamp for a relay, was not being took into account, because the router status was being updated after updating the timestamps.