[feature request]extract list object handling from ObjectFilter to ResponseFilter

[rambohe]

What would you like to be added:
In each ObjectFilter(like masterservice, servicetopology, etc.), filter need to handle standalone object and List object. For example, masterservice filter need to handle *v1.ServiceList and *v1.Service as following:

openyurt/pkg/yurthub/filter/masterservice/filter.go

Lines 82 to 95 in acec197

 func (msf *masterServiceFilter) Filter(obj runtime.Object, _ <-chan struct{}) runtime.Object { 
 	switch v := obj.(type) { 
 	case *v1.ServiceList: 
 		for i := range v.Items { 
 			mutated := msf.mutateMasterService(&v.Items[i]) 
 			if mutated { 
 				// short-circuit break 
 				break 
 			} 
 		} 
 		return v 
 	case *v1.Service: 
 		msf.mutateMasterService(v) 
 		return v 

And handling list object is just a collection of standalone object handling, so it is a good idea to handle list object in a common place like ResponseFilter instead of handling them in every ObjectFilter.

So i will make a pull request to improve list object handling in ObjectFilter, then ObjectFilter only need to handle standalone object(like *v1.Service).

others
/kind feature