Allow changing metallb default pool name (#8111)

roles/kubernetes-apps/metallb/defaults/main.yml

@@ -18,3 +18,4 @@ metallb_speaker_tolerations:
     key: node-role.kubernetes.io/control-plane
     operator: Exists
 metallb_controller_tolerations: []
+metallb_pool_name: "loadbalanced"

roles/kubernetes-apps/metallb/templates/metallb-config.yml.j2

@@ -15,7 +15,7 @@ data:
 {% endfor %}
 {% endif %}
     address-pools:
-    - name: loadbalanced
+    - name: {{ metallb_pool_name }}
       protocol: {{ metallb_protocol }}
       addresses:
 {% for ip_range in metallb_ip_range %}