PYTHON-2138 Fix NameError: name 'AwsSaslContext' is not defined
PYTHON-2138 Fix NameError: name 'AwsSaslContext' is not defined

mongodb/mongo-python-driver,ShaneHarvey/mongo-python-driver,ShaneHarvey/mongo-python-driver,ShaneHarvey/mongo-python-driver,mongodb/mongo-python-driver,mongodb/mongo-python-driver