Back-feed gauge stats back into statsite

Statsite does not treat gauges the same way that statsd does. When
statsite flushes stats to the sinks, it clears the gauges back to 0.
Armon recommended in [0] to have the sink send gauges back into statsite
to seed the value back to the previous value.

[0] https://github.com/armon/statsite/issues/69

It feels a bit hacky, and I'm not sure how best to handle all of the possible statsite connection options (TCP port, UDP port, host) so right now it's assuming UDP and asking for the port. Ideas on making this better?