ipa-restore must stop tracking PKINIT cert in the preparation phase
ipa-restore calls certmonger to stop tracking the PKI certs, HTTP and DS certs.
It must also stop tracking the newly introduced PKINIT cert (stored in
/var/kerberos/krb5kdc/kdc.crt).
Otherwise the restore operation ends up with PKINIT cert tracked twice and
uninstallation fails.
https://fedorahosted.org/freeipa/ticket/6570
Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>