no_proxy is a pain to get right, and having proxy variables present causes issues
(k8s components get proxy configuration after upgrade, see #7100)

It's better to only configure what require proxy:
- the runtime (containerd/docker/crio)
- the package manager + apt_key
- the download tasks

Tested with the following clusters
- 4 CentOS 8 nodes
- 1 Ubuntu 20.04 node

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

* bump minimal ansible version to 2.8.0

* check ansible version in separate playbook

* Gather just the necessary facts

* Move fact gathering to separate playbook.

It's unnecessary and breaks when running from within a docker container:
```
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: TimeoutError: Timer expired after 10 seconds
fatal: [localhost]: FAILED! => {"changed": false, "cmd": "/usr/sbin/udevadm info --query property --name /dev/mapper/vg00-root", "msg": "Timer expired after 10 seconds", "rc": 257}
```

* Added support of bastion host for reset.yaml

* Empty commit to triger CI

- Creates and defaults an ansible variable for every configuration option in the `kubeproxy.config.k8s.io/v1alpha1` type spec
  - Fixes vars that were orphaned by removing non-kubeadm
  - Fixes previously harcoded kubeadm values
- Introduces a `main` directory for role default files per component (requires ansible 2.6.0+)
  - Split out just `kube-proxy.yml` in this first effort
- Removes the kube-proxy server field patch task

We should continue to pull out other components from `main.yml` into their own defaults files as I did here for `defaults/main/kube-proxy.yml`. I hope for and will need others to join me in this refactoring across the project until each component config template has a matching role defaults file, with shared defaults in `kubespray-defaults` or `downloads`

* Remove Vault

* Remove reference to 'kargo' in the doc

* change check order

Only exclude buggy Ansible v2.7.0 (https://github.com/ansible/ansible/issues/46600#issuecomment-433863628)

Fixup #3589

- adding additional directories to cleanup (rkt/vault)
- targeting kubespray ansible groups instead of all

Migrate older inline= syntax to pure yml syntax for module args as to be consistant with most of the rest of the tasks
Cleanup some spacing in various files
Rename some files named yaml to yml for consistancy

This deletes everything related to the cluster and allows to start from
scratch.