don't copy a queryset's result constructor
don't copy a queryset's result constructor

This is not needed as it is created per-execution. It was causing
problems with deepcopy in Python 2.6.

thobbs/python-driver,thobbs/python-driver,vipjml/python-driver,vipjml/python-driver,thelastpickle/python-driver,coldeasy/python-driver,datastax/python-driver,stef1927/python-driver,mambocab/python-driver,datastax/python-driver,thelastpickle/python-driver,stef1927/python-driver,coldeasy/python-driver,mambocab/python-driver