Make it work with Cluster Autoscaler

[tibordp]

Obviously the nodes would go out of sync, but other than that it should be possible to use cluster autoscaler:

https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/cloudprovider/hetzner/README.md

TODOS:

• [x] Make sure Wigglenet can automatically allocate IPv4 node subnets and auto-detect IPv6 pod subnet from eth0 address
• [x] Move the node setup script to cloudinit
• [x] Make the bootstrap tokens not expire
• [x] Test