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"/>
```

this.local = local;
    }
    public String getStub() {
        return stub;
    }
    public void setStub(Boolean stub) {
        if (stub == null) {
            setStub((String) null);
        } else {
            setStub(stub.toString());
        }
    }
    public void setStub(String stub) {
        checkName("stub", stub);
        this.stub = stub;
    }
    public String getCluster() {
        return cluster;
    }
    public void setCluster(String cluster) {
        checkExtension(Cluster.class, CLUSTER_KEY, cluster);
        this.cluster = cluster;
    }
    public String getProxy() {
        return proxy;
    }
    public void setProxy(String proxy) {
        checkExtension(ProxyFactory.class, PROXY_KEY, proxy);
        this.proxy = proxy;
    }