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/k3s/server/defaults/main.yml

@@ -0,0 +1,12 @@
+---
+k3s_server_location: /var/lib/rancher/k3s
+server_init_args: >-
+  {% if groups['server'] | length > 1 %}
+    --token {{ k3s_token }}
+    {% if ansible_host == hostvars[groups['server'][0]]['ansible_host'] | default(groups['server'][0]) %}
+      --cluster-init
+    {% else %}
+      --server https://{{ hostvars[groups['server'][0]]['ansible_host'] | default(groups['server'][0]) }}:{{ api_port }}
+    {% endif %}
+  {% endif %}
+  {{ extra_server_args | default('') }}