Add +optional tag to all fields with omitempty json tag

cmd/libs/go2idl/client-gen/test_apis/testgroup.k8s.io/v1/types.go

@@ -29,12 +29,15 @@ type TestType struct {
 	// the next tag removes the field from openapi spec. Adding unversioned objectMeta bring in a whole set of
 	// unversioned objects in the generate file that is not used anywhere other than this test type.
 	// +k8s:openapi-gen=false
+	// +optional
 	api.ObjectMeta `json:"metadata,omitempty"`
+	// +optional
 	Status         TestTypeStatus `json:"status,omitempty"`
 }
 
 type TestTypeList struct {
 	unversioned.TypeMeta `json:",inline"`
+	// +optional
 	unversioned.ListMeta `json:"metadata,omitempty"`
 
 	Items []TestType `json:"items"`