Fix rpc generator bug (#799)

* Fix rpc自动生成generate bug

* Delete mock

tools/goctl/rpc/generator/gencall.go

@@ -16,7 +16,6 @@ import (
 const (
 	callTemplateText = `{{.head}}
 
-//go:generate mockgen -destination ./{{.name}}_mock.go -package {{.filePackage}} -source $GOFILE
 
 package {{.filePackage}}