Config overhaul

* Options are allowed at any scope (so you can set a server etc.
  globally)
* smockron_enabled is renamed smockron ("smockron on", "smockron off")
  and is actually honored.
Try to make sure we only get called once per request.

Doesn't seem to work quite right yet, still logging twice for / when it
does a subrequest to the index page.
Really rough zeromq stuff

I got it to connect and send accounting packets, but it doesn't respect
the config parameters for the server at this point. Storing the socket
properly so that there's only one socket per destination is going to be
a pain.
Shrinkwrap