improve IAM module

Signed-off-by: hongming <talonwan@yunify.com>

vendor/k8s.io/apimachinery/pkg/util/validation/field/errors.go

@@ -204,7 +204,7 @@ func Forbidden(field *Path, detail string) *Error {
 // Invalid, but the returned error will not include the too-long
 // value.
 func TooLong(field *Path, value interface{}, maxLength int) *Error {
-	return &Error{ErrorTypeTooLong, field.String(), value, fmt.Sprintf("must have at most %d characters", maxLength)}
+	return &Error{ErrorTypeTooLong, field.String(), value, fmt.Sprintf("must have at most %d bytes", maxLength)}
 }
 
 // TooMany returns a *Error indicating "too many". This is used to