- [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.

### Environment

* Dubbo version: 2.7.5-SNAPSHOT
* Operating System version: macos
* Java version: 1.8.0_131

### Steps to reproduce this issue

We could run the following UT, then we could find the issue:

```
        ApplicationConfig application = new ApplicationConfig("provider");

        ServiceConfig<DemoService> service = new ServiceConfig<DemoService>();
        service.setProtocol(new ProtocolConfig("dubbo", 20880));
        service.setRegistry(new RegistryConfig(RegistryConfig.NO_AVAILABLE));
        service.setInterface(DemoService.class);
        service.setRef(new DemoServiceImpl());

        ConsumerConfig consumer = new ConsumerConfig();
        consumer.setLazy(true);

        ReferenceConfig<DemoService> reference = new ReferenceConfig<DemoService>();
        reference.setConsumer(consumer);
        reference.setRegistry(new RegistryConfig(RegistryConfig.NO_AVAILABLE));
        reference.setInterface(DemoService.class);
        reference.setUrl("dubbo://" + NetUtils.getLocalHost() + ":20880?" + DemoService.class.getName());

        DubboBootstrap bootstrap = DubboBootstrap.getInstance()
            .application(application)
            .service(service)
            .reference(reference)
            .start();

        Assert.assertEquals("true", reference.toUrls().get(0).getParameter("lazy"));
```

### Expected Result

Expected "lazy" : true

### Actual Result

Actual "lazy": false

private static ProtocolConfig convertProviderToProtocol(ProviderConfig provider) {
        ProtocolConfig protocol = new ProtocolConfig();
        protocol.setName(provider.getProtocol().getName());
        protocol.setServer(provider.getServer());
        protocol.setClient(provider.getClient());
        protocol.setCodec(provider.getCodec());
        protocol.setHost(provider.getHost());
        protocol.setPort(provider.getPort());
        protocol.setPath(provider.getPath());
        protocol.setPayload(provider.getPayload());
        protocol.setThreads(provider.getThreads());
        protocol.setParameters(provider.getParameters());
        return protocol;
    }
    @Deprecated
    private static ProviderConfig convertProtocolToProvider(ProtocolConfig protocol) {
        ProviderConfig provider = new ProviderConfig();
        provider.setProtocol(protocol);
        provider.setServer(protocol.getServer());
        provider.setClient(protocol.getClient());
        provider.setCodec(protocol.getCodec());
        provider.setHost(protocol.getHost());
        provider.setPort(protocol.getPort());
        provider.setPath(protocol.getPath());
        provider.setPayload(protocol.getPayload());
        provider.setThreads(protocol.getThreads());
        provider.setParameters(protocol.getParameters());
        return provider;
    }
    public boolean shouldExport() {