Merge changes I9c1995f8,Id6763781,I52e5c07f,I4706e32f,I7d74b226

* changes:
  Keep the first and last snapshot of variables.
  Generate GenericConfig objects from MakeConfig objects.
  Emit and parse the product config variables from kati/make
  Add class to fork and exec kati, based on the commandline option given.
  Add a CSV parser to parse the output from kati.