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/apis/meta/v1/time.go

@@ -37,11 +37,11 @@ type Time struct {
 	time.Time `protobuf:"-"`
 }
 
-// DeepCopy returns a deep-copy of the Time value.  The underlying time.Time
+// DeepCopyInto creates a deep-copy of the Time value.  The underlying time.Time
 // type is effectively immutable in the time API, so it is safe to
 // copy-by-assign, despite the presence of (unexported) Pointer fields.
-func (t Time) DeepCopy() Time {
-	return t
+func (t *Time) DeepCopyInto(out *Time) {
+	*out = *t
 }
 
 // String returns the representation of the time.