Enable cert files etc when ssl_mode is 'only'

templates/rabbitmq.config

@@ -8,7 +8,7 @@
 {% if ssl_port %}
      	{ssl_listeners, [{{ ssl_port }}]},
 {% endif %}
-{% if ssl_mode == "on" %}
+{% if ssl_mode == "on" or ssl_mode == "only" %}
     	{ssl_options, [
  	        {verify, verify_peer},
 {% if ssl_client %}