when being added by a new peer, try to add it as well

[thepiwo]

• when a peer we don't know yet calls our /info find his uri (phenix should have some kind of method) and try to add him as well, if we don't know him and if the genesis_block matches
• maybe check if it is a aeclient type of peer through server response header

[thepiwo]

@cheezus1 @d-velev whats the status of this?