PYTHON-1206 - Fix race in test_operation_failure
PYTHON-1206 - Fix race in test_operation_failure

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