### Environment

* Dubbo version: 2.7.3
* Operating System version: CentOS7
* Java version: 1.8

### Steps to reproduce this issue

1. Set two protocal, with different "register" attribute

```xml
<dubbo:protocol name="dubbo" port="8751" register="true"  />
<dubbo:protocol name="hessian" port="8752" register="false" />
```

2. use the zookeeper registry center

```xml
<dubbo:registry address="..." file="./.dubbo_cache" />
```

3. start the server and view the provider in zkCli


### Expected Result
only the dubbo is registed

### Actual Result
the dubbo and hession protocol are registed

public Boolean getExport() {
        return export;
    }
    public void setExport(Boolean export) {
        this.export = export;
    }
    public Integer getWeight() {
        return weight;
    }
    public void setWeight(Integer weight) {
        this.weight = weight;
    }
    @Parameter(escaped = true)
    public String getDocument() {
        return document;
    }
    public void setDocument(String document) {
        this.document = document;
    }
    public String getToken() {
        return token;
    }
    public void setToken(Boolean token) {
        if (token == null) {
            setToken((String) null);
        } else {
            setToken(String.valueOf(token));
        }
    }
    public void setToken(String token) {