deployment: s/mw_statsd/mw_carbon/

Port 2003 is actually Carbon, not statsd, so stop lying and name the
$mw_statsd_{host,port} & MW_STATSD_{HOST,PORT} variables accordingly.

Change-Id: Iec7f90c11e18a8b5c41e004fa6676a58d6d164cf
deployment: switch carbon host to tungsten

Graphite has been moved to tungsten, switch the (newly renamed) puppet
variable from professor to tungsten and restore the "show code deploys"
Graphite feature that got broken during the transition.

Change-Id: I9ef9d6e9228e9e00a633c98e582b5ccb4f6c9186