Revert changes to Disco client

cmd/rqlited/main.go

@@ -354,7 +354,7 @@ func determineJoinAddresses() ([]string, error) {
 	if discoID != "" {
 		log.Printf("registering with Discovery Service at %s with ID %s", discoURL, discoID)
 		c := disco.New(discoURL)
-		r, err := c.Register(discoID, "http", apiAdv)
+		r, err := c.Register(discoID, apiAdv)
 		if err != nil {
 			return nil, err
 		}

disco/client.go

@@ -40,9 +40,9 @@ func (c *Client) URL() string {
 
 // Register attempts to register with the Discovery Service, using the given
 // proto and address.
-func (c *Client) Register(id, proto, addr string) (*Response, error) {
+func (c *Client) Register(id, addr string) (*Response, error) {
 	m := map[string]string{
-		"addr": fmt.Sprintf("%s:%s", proto, addr),
+		"addr": addr,
 	}
 
 	url := c.registrationURL(c.url, id)