[issue20815] ipaddress unit tests PEP8

[Nick Coghlan]

Nick Coghlan added the comment:

I'd suggest focusing more on the structured tests at the top of the file - the ones further down we largely incorporated wholesale from the original ipaddr project, and didn't go back and enforce PEP 8 compliance, but the new tests should follow the style guide.

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<http://bugs.python.org/issue20815>
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