我们使用方法分组来用dubbo，每个分组有自己权限，但是dubbo:registry标签 username & password 不生效，
让我不得不使用
```
    <dubbo:registry
            address="zookeeper://username:pwd@ip:port"
            group="xxx"/>
```
这种写法失效
```
    <dubbo:registry
            address="zookeeper://ip:port"
            username="username"
            password="pwd"/>
```

appendParameters(map, config);
                    map.put(PATH_KEY, RegistryService.class.getName());
                    appendRuntimeParameters(map);
                    if (!map.containsKey(PROTOCOL_KEY)) {
                        map.put(PROTOCOL_KEY, DUBBO_PROTOCOL);
                    }
                    List<URL> urls = UrlUtils.parseURLs(address, map);
                    for (URL url : urls) {
                        url = URLBuilder.from(url)
                                .addParameter(REGISTRY_KEY, url.getProtocol())
                                .setProtocol(REGISTRY_PROTOCOL)
                                .build();
                        if ((provider && url.getParameter(REGISTER_KEY, true))
                                || (!provider && url.getParameter(SUBSCRIBE_KEY, true))) {
                            registryList.add(url);
                        }
                    }
                }
            }
        }
        return registryList;
    }
    /**
     *
     * Load the monitor config from the system properties and conversation it to {@link URL}
     *
     * @param registryURL
     * @return
     */
    protected URL loadMonitor(URL registryURL) {