PYTHON-596 adding a test for server error
PYTHON-596 adding a test for server error

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