[node identifier] connId, memberId, address

[KIMSJ]

now we manage member with MemberId and Address

type MemberId = string

type Address struct {
	Ip   string
	Port uint16
}

type Member struct {
	Id   MemberId
	Addr Address
}

And connection has ConnId

type ConnId = string

I think MemberId and ConnId are very confusing in using.
So, i suggest we use MemberId and ConnId as same thing but leave to divide meaning.

MemberId : identifier of members (include myself)
ConnId : identifier of connections (don't include myself)

etc)
RBC needs identifier of proposer(who propose the consensus first). pb.message.RBC needs proposer's identifier and i think it maybe address of proposer node.

So, i suggest modifying memberMap can search member also with Address