Challenges:
1. etcd booting before bootkube meant I missed certs
2. etcd can run without certs, but managing docker network
over static pod manifests might be tricky :fingers_crossed:
This brings up etcd using the terraform docker provider
to my Digital Ocean VPN Server. The listen address is set to the
VPN Address (10.8.0.1 = openvpn master server, also running on the
same server).
/mnt/disk is a Digital Ocean Volume attached to the instance.