cloud-init do not seem to correctly populate /etc/resolv.conf 

After a boot of Kubic with the kubeadm system role, the resulting
/etc/resolv.conf has "; Created by cloud-init on instance boot automatically,
do not edit" followed by the usual "### /etc/resolv.conf file autogenerated by
netconfig" preamble, but has no name resolver configured

This results in a system that has no working name resolution

https://openqa.opensuse.org/tests/788925#step/first_boot/23

All other networking seems to behave fine

EXPECTED BEHAVIOUR
cloud-init should correctly populate /etc/resolv.conf when configuring the
network of a system

WORKAROUND
docker automatically disables cloud-inits network configuration by editing
/etc/cloud/cloud.cfg.d/01-network.cfg - for non-docker runtimes Kubic intends
to do something similar until this bug is fixed at least.