Multiple uid search
Before deploying this code, the configuration of the PerunIdentity module for idp in saml20-idp-hosted.php must be changed. New configuration option uidsAttr must be defined. It contains array of user ID attribute names, e.g. 'uidsAttr' => array('eduPersonUniqueId', 'eduPersonPrincipalName', 'eduPersonTargetedIDString', 'nameid'),