When the GeoIP databases get refreshed (weekly), we want PowerDNS to
reload them. Do this by running pdns_control reload in ExecStartPost.

These are used to signal the start of the document in a stream of many
documents. As Ansible only supports one YAML document per file this is
unnecessary. About a third of our YAML documents already lacked these.

The intention is to use this config for other domains besides a mirror.