Auto-deploy templates, HA support now possible.

[xanmanning]

This merge will bring auto-deploy templates (thanks to @nolte) and HA control nodes using a database backend or experimental dqlite.

Example playbook for HA Deployment:

- hosts: k3s_nodes
  become: true
  vars:
    molecule_is_test: true
    k3s_control_node_address: loadbalancer  # This is either DNS round-robin or a HA load balancer
    k3s_datastore_endpoint: "postgres://postgres:verybadpass@database:5432/postgres?sslmode=disable"  # This is meant to be a HA PostgreSQL database, can by MySQL or etcd.
  pre_tasks:
    # You would do this in inventory or host_vars/ however this will quickly set two nodes to a control node.
    - name: Set each node to be a control node
      set_fact:
        k3s_control_node: true
      when: inventory_hostname in ['node1', 'node3']
  roles:
    - role: xanmanning.k3s