Revocation of host/service certs on host/service deletion or other operations is broken when cert is issued by a lightweight (sub)CA, causing the delete operation to be aborted. Look up the issuing CA and pass it to 'cert_revoke' to fix the issue. Fixes: https://fedorahosted.org/freeipa/ticket/6221 Reviewed-By: Jan Cholasta <jcholast@redhat.com>