ansible-inventories/gentner#2234 Set x-real-ip also if backend varnish bigpipe is being used

templates/haproxy_cfg.jinja2

@@ -438,6 +438,7 @@ backend backend_varnish_bigpipe
 {% endif %}
   no option http-buffer-request
   option httpchk HEAD /varnishcheck
+  http-request set-header x-real-ip %[src]
   http-check expect status 200
   option forwardfor
   hash-type consistent