Add HA option, change to yaml inventory, cleanup

- HA option for multiple server nodes using embedded etcd
- Switch to yaml inventory file for easier editing and combining vars
- Update to full ansible module names
- Change master/node names to server/agent
- Cleanup small linting errors
- Add reboot playbook which staggers reboot to keep HA cluster up
- Move playbooks to playbook directory

Signed-off-by: Derek Nola <derek.nola@suse.com>

roles/download/tasks/main.yml

@@ -1,5 +1,4 @@
 ---
-
 - name: Download k3s binary x64
   ansible.builtin.get_url:
     url: https://github.com/k3s-io/k3s/releases/download/{{ k3s_version }}/k3s