Move more socket options into the flow framework.

adsbus/send.c

@@ -39,6 +39,7 @@ static void send_get_hello(struct buf **, void *);
 static struct flow _send_flow = {
 	.name = "send",
 	.socket_ready = socket_ready_send,
+	.socket_connected = socket_connected_send,
 	.new = send_new,
 	.get_hello = send_get_hello,
 	.ref_count = &peer_count_out,
@@ -105,8 +106,6 @@ static void send_new(int fd, void *passthrough, struct peer *on_close) {
 
 	peer_count_out++;
 
-	socket_send(fd);
-
 	struct send *send = malloc(sizeof(*send));
 	assert(send);