* 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.