Update lightweight CA serial after renewal
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>