Fix a bulk operations test for MongoDB 3.2 behavior change
Fix a bulk operations test for MongoDB 3.2 behavior change

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