Add Validator from github.com/go-playground/validator for LDAP config

Add error function to check if there are any parent error

errors/errors.go

@@ -92,6 +92,7 @@ type Error interface {
 
 	IsError(e error) bool
 	HasError(err error) bool
+	HasParent() bool
 
 	AddParent(parent ...error)
 	SetParent(parent ...error)
@@ -243,6 +244,10 @@ func (e *errors) HasError(err error) bool {
 	return false
 }
 
+func (e *errors) HasParent() bool {
+	return len(e.p) > 0
+}
+
 func (e *errors) SetParent(parent ...error) {
 	e.p = make([]Error, 0)
 	e.AddParent(parent...)