saml2: use authn_request_signature_verify_hint as setting for logout request signature verify hint
saml2: use authn_request_signature_verify_hint as setting for logout request signature verify hint

pu239ppy/authentic2,pu239ppy/authentic2,pu239ppy/authentic2,BryceLohr/authentic,pu239ppy/authentic2,BryceLohr/authentic,adieu/authentic2,adieu/authentic2,adieu/authentic2,BryceLohr/authentic,BryceLohr/authentic,adieu/authentic2