The inventory file generated by Terraform produces the following warnings:
```
[WARNING]: * Failed to parse <PATH>/kubespray/contrib/terraform/hetzner/inventory.ini with ini plugin:
<PATH>/kubespray/contrib/terraform/hetzner/inventory.ini:21: Section [k8s_cluster:children] includes undefined group: kube-master
...
[WARNING]: Could not match supplied host pattern, ignoring: kube-master
PLAY [Add kube-master nodes to kube_control_plane] ********************************************************************************************************
skipping: no hosts matched
[WARNING]: Could not match supplied host pattern, ignoring: kube-node
PLAY [Add kube-node nodes to kube_node] *******************************************************************************************************************
skipping: no hosts matched
```
* Remove deprecated provider and fix flatcar configs
* Refactor for DRYness
* Add missing line endings
* Enable tests for hetzner terraform in CI
* Add missing inventory for CI tests
* - add ability to specify the network_zone in hetzner terraform
- Export the network id from hetzner terraform the the generated inventory.ini
* - Add with_networks variable to allow different deployments of hcloud controller manager
- Add network id to hcloud controller secret (added via the inventory)
- Don't include extra_args if it's not set
