This patch add a certauth plugin which allows the IPA server to support PKINIT for certificates which do not include a special SAN extension which contains a Kerberos principal but allow other mappings with the help of SSSD's certmap library. Related to https://pagure.io/freeipa/issue/4905 Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com> Reviewed-By: David Kupka <dkupka@redhat.com>