Unversioned types should not use ambiguous go-int

All external types that are not int64 are now marked as int32,
including
IntOrString. Prober is now int32 (43 years should be enough of an initial
probe time for anyone).

Did not change the metadata fields for now.

pkg/kubectl/rolling_updater.go

@@ -489,7 +489,7 @@ func extractMaxValue(field intstr.IntOrString, name string, value int) (int, err
 		if field.IntVal < 0 {
 			return 0, fmt.Errorf("%s must be >= 0", name)
 		}
-		return field.IntVal, nil
+		return field.IntValue(), nil
 	case intstr.String:
 		s := strings.Replace(field.StrVal, "%", "", -1)
 		v, err := strconv.Atoi(s)