- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [x] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Steps to reproduce this issue

1. provider 开启认证 `dubbo.provider.token=true`
2. 调用异常
```
org.apache.dubbo.rpc.RpcException: Invalid token! Forbid invoke remote service interface org.test.apache.dubbo.interfaces.PeopleService method work() from consumer 192.168.1.3 to provider 192.168.1.3, consumer incorrect token is 54ff0e8d-e486-4986-823d-f028302d5fbb
```
### 原因
consumer 在获取token的时候，先获取 Instance 的 token ，如果没有再获取 interface 的 token.
`实例 token`
![image](https://user-images.githubusercontent.com/43994656/127740178-31ac570a-ce98-4fc9-9e27-d87236fd86da.png)
`接口 token`
![image](https://user-images.githubusercontent.com/43994656/127740200-d2cc7833-5092-4043-936a-3fcb3b07d046.png)
`最终获取的 token 是实例的 token`
![image](https://user-images.githubusercontent.com/43994656/127740240-4c4ba965-1e2b-4282-b717-67afaa9a8b93.png)

https://github.com/apache/dubbo/blob/6c8046aa43771ced3d725af4fb8e7455166fe9ea/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/InstanceAddressURL.java#L142-L148

public InstanceAddressURL(
            ServiceInstance instance,
            MetadataInfo metadataInfo
    ) {
        this.instance = instance;
        this.metadataInfo = metadataInfo;
    }
    public ServiceInstance getInstance() {
        return instance;
    }
    public MetadataInfo getMetadataInfo() {
        return metadataInfo;
    }
    @Override
    public String getServiceInterface() {
        return RpcContext.getServiceContext().getInterfaceName();
    }
    public String getGroup() {
        return RpcContext.getServiceContext().getGroup();
    }
    public String getVersion() {
        return RpcContext.getServiceContext().getVersion();
    }
    @Override
    public String getProtocol() {
        return RpcContext.getServiceContext().getProtocol();
    }
    @Override
    public String getProtocolServiceKey() {
        return RpcContext.getServiceContext().getProtocolServiceKey();