For CA replicas to pick up renewed lightweight CA signing
certificates, the authoritySerial attribute can be updated with the
new serial number.
Update the renew_ca_cert script, which is executed by Certmonger
after writing a renewed CA certificate to the NSSDB, to update the
authoritySerial attribute if the certificate belongs to a
lightweight CA.
Part of: https://fedorahosted.org/freeipa/ticket/4559
Reviewed-By: Jan Cholasta <jcholast@redhat.com>