Dogstream clobber

[alq666]

@clofresh ran into the problem where only the last custom parser was getting its results saved. That's caused by the output.update that was replacing

{ 'dogstream': [old, old, old]}

with

{ 'dogstream': [new, new, new]}

Now we should get:

{ 'dogstream': [old, old, old, new, new, new] }