add support in core IDP for association groups which are used to share associations between SAML 2 and ADFS IDPs, to enable cross-protocol single-logout (thanks Olav)
add support in core IDP for association groups which are used to share associations between SAML 2 and ADFS IDPs, to enable cross-protocol single-logout (thanks Olav)

sgomez/saml2,newmen/saml2,ArtemTeleshev/php-saml2,madmatt/saml2,sitya/saml2,simplesamlphp/saml2,cb8/saml2