[Twisted-Python] Process pools and logging

[Phil Mayers]

Before I re-invent the wheel, is there a twisted library that will let me:

  1. Fire up child worker processes
  2. That log to a logObserver coming out in the parent
  3. Manage the whole lot as a .tac file

Note I *don't* need deferToProcess or similar in this situation. I just 
need to fire up N processes but have them managed by and logging "to" a 
single parent controlled by twistd.

(FWIW, they're stateless workers that pull from a work queue).