func (sys *IAMSys) ListUsers(ctx context.Context) (map[string]madmin.UserInfo, error) {
	if !sys.Initialized() {
		return nil, errServerNotInitialized
	}
	select {
	case <-sys.configLoaded:
		return sys.store.GetUsers(), nil
	case <-ctx.Done():
		return nil, ctx.Err()
	}
}

// ListLDAPUsers - list LDAP users which has
func (sys *IAMSys) ListLDAPUsers(ctx context.Context) (map[string]madmin.UserInfo, error) {