Fix dual-stack clusters with multiple master nodes (#237)

* Test IPv6 scenario with two master nodes

* Fix IPv6 multimaster setup

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Co-authored-by: Techno Tim <timothystewart6@gmail.com>

roles/k3s/master/defaults/main.yml

@@ -9,7 +9,7 @@ server_init_args: >-
     {% if ansible_hostname == hostvars[groups['master'][0]]['ansible_hostname'] %}
       --cluster-init
     {% else %}
-      --server https://{{ hostvars[groups['master'][0]].k3s_node_ip }}:6443
+      --server https://{{ hostvars[groups['master'][0]].k3s_node_ip | split(",") | first | ansible.utils.ipwrap }}:6443
     {% endif %}
     --token {{ k3s_token }}
   {% endif %}