- [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

ProtocolConfig protocolConfig = new ProtocolConfig();
                        protocolConfig.setId(id);
                        protocolConfig.refresh();
                        tmpProtocols.add(protocolConfig);
                    }
                }
            });
            if (tmpProtocols.size() > arr.length) {
                throw new IllegalStateException("Too much protocols found, the protocols comply to this service are :" + protocolIds + " but got " + protocols
                        .size() + " registries!");
            }
            setProtocols(tmpProtocols);
        }
    }
    public Class<?> getInterfaceClass() {
        if (interfaceClass != null) {
            return interfaceClass;
        }
        if (ref instanceof GenericService) {
            return GenericService.class;
        }
        try {
            if (interfaceName != null && interfaceName.length() > 0) {
                this.interfaceClass = Class.forName(interfaceName, true, Thread.currentThread()
                        .getContextClassLoader());
            }
        } catch (ClassNotFoundException t) {
            throw new IllegalStateException(t.getMessage(), t);
        }
        return interfaceClass;