## 问题描述
使用如下方式配置RegistryConfig bean时

```java
    @Bean
    public RegistryConfig registryConfig() {
        RegistryConfig registryConfig = new RegistryConfig();
        registryConfig.setProtocol("zookeeper");
        registryConfig.setAddress("localhost");
        registryConfig.setPort(2181);
        return registryConfig;
    }
```

提示无法与zookeeper建立连接，调试代码发现，zookeeper链接为

`zookeeper://localhost:9090/ConfigCenterConfig?check=true&config-file=dubbo.properties&group=dubbo&highest-priority=false&namespace=dubbo&timeout=3000`

使用了9090端口，未使用2181端口，registryConfig.setPort()不生效。

对比测试，使用registryConfig.setAddress("localhost:2181")方式可以生效。


this.cache = cache;
        return this;
    }
    public ReferenceConfigCache getCache() {
        if (cache == null) {
            cache = ReferenceConfigCache.getCache();
        }
        return cache;
    }
    public DubboBootstrap exportAsync() {
        this.exportAsync = true;
        return this;
    }
    public DubboBootstrap referAsync() {
        this.referAsync = true;
        return this;
    }
    @Deprecated
    public void init() {
        initialize();
    }
    /**
     * Initialize
     */
    private void initialize() {
        if (!initialized.compareAndSet(false, true)) {
            return;
        }
        ApplicationModel.initFrameworkExts();
        startConfigCenter();