refactor: openpitrix module

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

vendor/github.com/koding/multiconfig/multivalidator.go

@@ -0,0 +1,28 @@
+package multiconfig
+
+type multiValidator []Validator
+
+// MultiValidator accepts variadic validators and satisfies Validator interface.
+func MultiValidator(validators ...Validator) Validator {
+	return multiValidator(validators)
+}
+
+// Validate tries to validate given struct with all the validators. If it doesn't
+// have any Validator it will simply skip the validation step. If any of the
+// given validators return err, it will stop validating and return it.
+func (d multiValidator) Validate(s interface{}) error {
+	for _, validator := range d {
+		if err := validator.Validate(s); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// MustValidate validates the struct, it panics if gets any error
+func (d multiValidator) MustValidate(s interface{}) {
+	if err := d.Validate(s); err != nil {
+		panic(err)
+	}
+}