add support for realip

nginx/templates/config.jinja

 }
 
 http {
+    {% if 'set_real_ips' in nginx -%}
+    {% for ip in nginx.get('set_real_ips', {}).get('ips', []) -%}
+    set_real_ip_from {{ ip }};
+    {% endfor -%}
+    real_ip_header {{ nginx.get('set_real_ips', {}).get('real_ip_header', 'X-Forwarded-For') }};
+
+    {% endif -%}
+
     include /etc/nginx/mime.types;
     default_type  application/octet-stream;
     log_format main '$scheme://$host:$server_port$uri$is_args$args $remote_addr:$remote_user "$request" $request_time $request_length:$bytes_sent $status "$http_referer" "$http_user_agent" "$http_x_forwarded_for"';