Move address into transport config

This makes it possible to use a factory function to create a transport of the right type and not having to repeat the address when calling Transport.Connect()

xmpp_transport.go

@@ -14,10 +14,10 @@ type XMPPTransport struct {
 	conn net.Conn
 }
 
-func (t *XMPPTransport) Connect(address string) error {
+func (t *XMPPTransport) Connect() error {
 	var err error
 
-	t.conn, err = net.DialTimeout("tcp", address, time.Duration(t.Config.ConnectTimeout)*time.Second)
+	t.conn, err = net.DialTimeout("tcp", t.Config.Address, time.Duration(t.Config.ConnectTimeout)*time.Second)
 	return err
 }