Make possible to configure port in nginx vhost used for munin web interface

group_vars/monitoring

@@ -7,6 +7,8 @@ with_mon: False
 with_munin: False
 with_munin_node: False
 munin_master_vhostname: localhost
+munin_master_vhostport: 80
+
 munin_masters:
   - 127.0.0.1
 munin_nodes:

roles/monitoring/templates/munin/nginx_vhost.j2

@@ -5,8 +5,8 @@
 # Nginx vhost for munin master
 
 server {
-    server_name {{ munin_master_vhostname }}
-    listen 80;
+    server_name {{ munin_master_vhostname }};
+    listen {{ munin_master_vhostport }};
 
     access_log  /var/log/nginx/munin.access.log;
     error_log   /var/log/nginx/munin.error.log;