Switch to nginx based access

- no longer direct access to unix socket. As responses can be chunked, we need
  to be able to parse that. The "easiest" solution was to use curl. But since
  curl cannot talk to unix socket yet, we had to reverse proxy the socker with
  nginx \o/

- no longer use events. After a couple of test, it seems to be not as reliable
  as expected (sometimes mute, sometimes crasy). So limit the tool to generate
  the conf when called.