PYTHON-2255 Reduce default keepalive time to 120 seconds to align with Azure defaults
PYTHON-2255 Reduce default keepalive time to 120 seconds to align with Azure defaults

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