These two settings are not set using the krb.init_info method, but used in
krb.enable_ssl.
The configuration of PKINIT fails in IPA 4.7.0 because of the issue
https://pagure.io/freeipa/issue/7655 where auto detection of the
master is not properly working. With the missing setting of krb.master_fqdn
the not workint auto detection has been triggered, which resulted in
failed PKINIT enablement.
The support for external cert files is not complete yet.
Please have a look at the example inventory file inventory/hosts.replica and
also the install and uninstall playbook files install-replica.yml and
uninstall-replica.yml