roles/openvpn: add defaults

server_fqdn: {{ ansible_hostname }}.{{ domain }} specification in
defaults/main.yaml

roles/openvpn/defaults/main.yaml

@@ -0,0 +1,3 @@
+---
+server_fqdn: '{{ inventory_hostname }}.{{ domain }}'
+...

roles/openvpn/tasks/main.yaml

@@ -18,6 +18,8 @@
   tags:
     - 'tls_int'
 
+# Shouldn't be required for TLSv1.3
+#
 #- name: create openvpn dh2048
 #  shell: 'openssl dhparam -out /etc/openvpn/dh2048.pem 2048'
 #  args: