PYTHON-1301/PYTHON-1302/PYTHON-1588 Remove deprecated cursor manager APIs#550

ShaneHarvey merged 3 commits intomongodb:mastermongodb/mongo-python-driver:masterfrom

ShaneHarvey:PYTHON-1588-give-creditShaneHarvey/mongo-python-driver:PYTHON-1588-give-creditCopy head branch name to clipboard