Send PeerUp/PeerDown downstream #57
Description
Right now Risotto only send the updates received via BMP Route Monitoring messages. It resolves duplicate updates and missing withdraws by maintaining a state.
Another way of keep track of the state is to store the Peer Up / Peer Down messages in database, and then compute the state in database directly. Risotto would become stateless. To do so, Risotto needs to send downstream those Peer Up and Peer Down messages.