bpo-39142: Avoid converting namedtuple instances to ConvertingTuple. (GH-17773)

bpo-39142: Avoid converting namedtuple instances to ConvertingTuple. (GH-17773)

This uses the heuristic of assuming a named tuple is a subclass of
tuple with a _fields attribute. This change means that contents of
a named tuple wouldn't be converted - if a user wants to have
ConvertingTuple functionality from a namedtuple, they will have to
implement it themselves.