generator function for faster callbacks #7

ADNS_State_completed should return Yield like a generator function to
allow callbacks to happen as quick as the DNS reply comes in. This should
be sufficient to deprecate run_max function call as it doesn't add any value.
http://www.python.org/doc/2.5.2/api/gen-objects.html

The deprecated "apply" call in ADNS.py can be replaced by a direct function
call.
http://docs.python.org/library/functions.html#apply