OIDC: `sid` in Front-Channel-Logout request is wrong
Concerned version
Version: %2.0.16
Summary
In 2.0.16, front Channel Logout request send the following:
build_urlencoded(
iss => $self->iss,
sid => $user_id,
);
According to OIDC specs, this is a wrong value. It should contain sid
claim sent in ID Token.
Fix depends on #2862 (closed).