[CodeReview 3.0] Dubbo in spring

1) DubboConfigConfigurationRegistrar duplicate with DubboComponentScanRegistrar.

DubboConfigConfigurationRegistrar only has one function call:

public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
    // initialize dubbo beans
    DubboSpringInitializer.initialize(registry);
}

but DubboComponentScanRegistrar also has this function call:

public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
    // initialize dubbo beans
    DubboSpringInitializer.initialize(registry);

    Set<String> packagesToScan = getPackagesToScan(importingClassMetadata);

    registerServiceAnnotationPostProcessor(packagesToScan, registry);
}