A token the OIDC directory rejects is an authentication failure, so it
counts toward the ban; a network, provider or configuration fault stays
an error and doesn't. Before, a rejected token was an error too, so bad
tokens never led to a ban.
The Keycloak container now imports a second realm, so test 10 checks
/api/discover and the PACC record answer with each domain's own provider.
Test 18 checks that eight sign-ins during an outage don't ban the client,
while bad tokens do.