Fix defaults for apiserver_loadbalancer_domain_name

Since we're not longer injecting pseudo DNS into /etc/hosts,
'lb-apiserver.kubernetes.local' (the previous default) won't resolve to
anything.

Instead, default to the loadbalancer IP if defined, or to the node local
loadbalancer if it's in use.

Make the necessary adjustements in use site to deal with ip addresses as
well as hostnames.

roles/kubernetes/control-plane/tasks/kubeadm-setup.yml

@@ -90,7 +90,7 @@
 # Nginx LB(default), If kubeadm_config_api_fqdn is defined, use other LB by kubeadm controlPlaneEndpoint.
 - name: Set kubeadm_config_api_fqdn define
   set_fact:
-    kubeadm_config_api_fqdn: "{{ apiserver_loadbalancer_domain_name | default('lb-apiserver.kubernetes.local') }}"
+    kubeadm_config_api_fqdn: "{{ apiserver_loadbalancer_domain_name }}"
   when: loadbalancer_apiserver is defined
 
 - name: Kubeadm | Create kubeadm config