Add ssl-cert-check to cacti server

Add monitoring of SSL certificates for openstack websites

Change-Id: I50b6a8aced7ae563381eb948ce4e8f854a6d85a9
Reviewed-on: https://review.openstack.org/30490
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins