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"/>
```

}
        }
    }
    private DynamicConfiguration getDynamicConfiguration(URL url) {
        DynamicConfigurationFactory factory = ExtensionLoader
                .getExtensionLoader(DynamicConfigurationFactory.class)
                .getExtension(url.getProtocol());
        DynamicConfiguration configuration = factory.getDynamicConfiguration(url);
        Environment.getInstance().setDynamicConfiguration(configuration);
        return configuration;
    }
    /**
     *
     * Load the registry and conversion it to {@link URL}, the priority order is: system property > dubbo registry config
     *
     * @param provider whether it is the provider side
     * @return
     */
    protected List<URL> loadRegistries(boolean provider) {
        // 
        List<URL> registryList = new ArrayList<URL>();
        if (CollectionUtils.isNotEmpty(registries)) {
            for (RegistryConfig config : registries) {
                String address = config.getAddress();
                if (StringUtils.isEmpty(address)) {
                    address = ANYHOST_VALUE;
                }
                if (!RegistryConfig.NO_AVAILABLE.equalsIgnoreCase(address)) {
                    Map<String, String> map = new HashMap<String, String>();
                    appendParameters(map, application);