Fix SELinux errors caused by enabling TLS on dogtag 389-ds instance. This fixes 2 AVCS: * One because we are enabling port 7390 because an SSL port must be defined to use TLS On 7389. * We were symlinking to the main IPA 389-ds NSS certificate databsae. Instead generate a separate NSS database and certificate and have certmonger track it separatelyI also noticed some variable inconsistency in cainstance.py. Everywhere else we use self.fqdn and that was using self.host_name. I found it confusing so I fixed it.