revert some protocol changes for now

grpc.go

@@ -71,13 +71,8 @@ func (g *grpcClient) next(request client.Request, opts client.CallOptions) (sele
 		}, nil
 	}
 
-	// only get the things that are of grpc protocol
-	selectOptions := append(opts.SelectOptions, selector.WithFilter(
-		selector.FilterLabel("protocol", "grpc"),
-	))
-
 	// get next nodes from the selector
-	next, err := g.opts.Selector.Select(service, selectOptions...)
+	next, err := g.opts.Selector.Select(service, opts.SelectOptions...)
 	if err != nil {
 		if err == selector.ErrNotFound {
 			return nil, errors.InternalServerError("go.micro.client", "service %s: %s", service, err.Error())