SAML Discovery Protocol (WAYF)
There is a discovery protocol in SAML different from the Common Domain Cookie specification: https://www.oasis-open.org/committees/download.php/28049/sstc-saml-idp-discovery-cs-01.pdf
This protocol is used for example by Renater WAYF: https://discovery.renater.fr/renater/WAYF
We need to support it in LemonLDAP::NG.