This gives it the ability to create a TXT record for acmechallenges.fedorainfracloud.org.
To allow certificates for other hostnames, those hostnames need a CNAME of "_acme-challenge.<hostname>" pointing to "acmechallenges.fedorainfracloud.org".
After that, create the two certificate requests for the API server and ingress default cert:
> oc -n openshift-config create -f cert_api.yml
> oc -n openshift-ingress create -f cert_apps.yml
This will start the request of the certificates.
Then run the following commands to update the ingress router (will take affect after its restart) and API server with their new certs: