drivers/amazonec2/amazonec2.go
func migrateStringToSlice(value string, values []string) (result []string) {
	if value != "" {
		result = append(result, value)
	}
	result = append(result, values...)
	return
}
func migrateStringToSlice(value string, values []string) (result []string) {
	if value != "" {
		result = append(result, value)
	}
	result = append(result, values...)
	return
}
// Support migrating single string Driver fields to slices.