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"/>
```

import static org.apache.dubbo.common.constants.CommonConstants.COMMA_SPLIT_PATTERN;
import static org.apache.dubbo.common.constants.CommonConstants.DUBBO_PROTOCOL;
import static org.apache.dubbo.common.constants.CommonConstants.FILE_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.INTERFACE_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.PATH_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.PID_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.PROTOCOL_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.RELEASE_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.SHUTDOWN_WAIT_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.SHUTDOWN_WAIT_SECONDS_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.TIMESTAMP_KEY;
import static org.apache.dubbo.common.constants.RegistryConstants.REGISTRY_KEY;
import static org.apache.dubbo.common.constants.RegistryConstants.REGISTRY_PROTOCOL;
import static org.apache.dubbo.common.constants.CommonConstants.D_REGISTRY_SPLIT_PATTERN;
import static org.apache.dubbo.common.extension.ExtensionLoader.getExtensionLoader;
import static org.apache.dubbo.config.Constants.DUBBO_IP_TO_REGISTRY;
import static org.apache.dubbo.config.Constants.LAYER_KEY;
import static org.apache.dubbo.config.Constants.LISTENER_KEY;
import static org.apache.dubbo.config.Constants.REGISTRIES_SUFFIX;
import static org.apache.dubbo.monitor.Constants.LOGSTAT_PROTOCOL;
import static org.apache.dubbo.registry.Constants.REGISTER_IP_KEY;
import static org.apache.dubbo.registry.Constants.REGISTER_KEY;
import static org.apache.dubbo.registry.Constants.SUBSCRIBE_KEY;
import static org.apache.dubbo.remoting.Constants.DUBBO_VERSION_KEY;
import static org.apache.dubbo.rpc.Constants.INVOKER_LISTENER_KEY;
import static org.apache.dubbo.rpc.Constants.LOCAL_KEY;
import static org.apache.dubbo.rpc.Constants.PROXY_KEY;
import static org.apache.dubbo.rpc.Constants.REFERENCE_FILTER_KEY;
import static org.apache.dubbo.rpc.Constants.RETURN_PREFIX;
import static org.apache.dubbo.rpc.Constants.THROW_PREFIX;