func (s virtualDiskSubresourceSorter) Less(i, j int) bool {
	mi := s[i].(map[string]interface{})
	mj := s[j].(map[string]interface{})
	return mi["unit_number"].(int) < mj["unit_number"].(int)
}
func (s virtualDiskSubresourceSorter) Less(i, j int) bool {
	mi := s[i].(map[string]interface{})
	mj := s[j].(map[string]interface{})
	return mi["unit_number"].(int) < mj["unit_number"].(int)
}
// Less helps implement sort.Interface for virtualDiskSubresourceSorter.