When unittesting this we found that the platform selecting class
hierarchies weren't working in all cases. If the subclass was directly
created (ie: LinuxHardware()), then it would use its inherited __new__()
to try to create itself. The inherited __new__ would look for
subclasses and end up calling its own __new__() again. This would
recurse endlessly. The new code detects when we want to find a subclass
to create (when the base class is used, ie: Hardware()) vs when to
create the class itself (when the subclass is used, ie:
LinuxHardware()).
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