### 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

String CONTEXTPATH_KEY = "contextpath";
    String LISTENER_KEY = "listener";
    String LAYER_KEY = "layer";
    /**
     * General
     */
    /**
     * Application name;
     */
    String NAME = "name";
    /**
     * Application owner name;
     */
    String OWNER = "owner";
    /**
     * Running application organization name.
     */
    String ORGANIZATION = "organization";
    /**
     * Application architecture name.
     */
    String ARCHITECTURE = "architecture";
    /**
     * Environment name
     */
    String ENVIRONMENT = "environment";
    /**
     * Test environment key.
     */
    String TEST_ENVIRONMENT = "test";