only sets nodeName in kubeadm-config when kube_override_hostname is set

roles/kubernetes/master/templates/kubeadm-config.yaml.j2

@@ -83,5 +83,7 @@ apiServerCertSANs:
 {% endfor %}
 certificatesDir: {{ kube_config_dir }}/ssl
 unifiedControlPlaneImage: "{{ hyperkube_image_repo }}:{{ hyperkube_image_tag }}"
+{% if kube_override_hostname|default('') %}
 nodeName: {{ inventory_hostname }}
+{% endif %}