net_transport.go
func (n *NetworkTransport) RequestVote(id ServerID, target ServerAddress, args *RequestVoteRequest, resp *RequestVoteResponse) error {
	return n.genericRPC(id, target, rpcRequestVote, args, resp)
}
func (n *NetworkTransport) RequestVote(id ServerID, target ServerAddress, args *RequestVoteRequest, resp *RequestVoteResponse) error {
	return n.genericRPC(id, target, rpcRequestVote, args, resp)
}
// RequestVote implements the Transport interface.