deepcopy: add interface deepcopy funcs

- add DeepCopyObject() to runtime.Object interface
- add DeepCopyObject() via deepcopy-gen
- add DeepCopyObject() manually
- add DeepCopySelector() to selector interfaces
- add custom DeepCopy func for TableRow.Cells

pkg/api/ref/ref_test.go

@@ -29,12 +29,23 @@ import (
 type FakeAPIObject struct{}
 
 func (obj *FakeAPIObject) GetObjectKind() schema.ObjectKind { return schema.EmptyObjectKind }
+func (obj *FakeAPIObject) DeepCopyObject() runtime.Object {
+	if obj == nil {
+		return nil
+	}
+	clone := *obj
+	return &clone
+}
 
 type ExtensionAPIObject struct {
 	metav1.TypeMeta
 	metav1.ObjectMeta
 }
 
+func (obj *ExtensionAPIObject) DeepCopyObject() runtime.Object {
+	panic("ExtensionAPIObject does not support DeepCopy")
+}
+
 func TestGetReference(t *testing.T) {
 
 	// when vendoring kube, if you don't force the set of registered versions (like make test does)