Milter-greylist

> I just looked at the code, and we already dump when smfi_main exits.
> atexit serves just as a safety net if libmilter calls exit(), 
> but I'm not
> sure if it can heppen.
> 

I library should never decide to exit on its own, it is supposed to return
error code if it has any trouble. Exiting is the privilege of the main program.
I do not know the libmilter is conforming, but if not it must be fixed.