Checks whether the tearDown method is the BasePlug implementation.

def uses_base_tear_down(cls):
    """Checks whether the tearDown method is the BasePlug implementation."""
    this_tear_down = getattr(cls, 'tearDown')
    base_tear_down = getattr(BasePlug, 'tearDown')
    return this_tear_down.__code__ is base_tear_down.__code__