[issue20815] ipaddress unit tests PEP8

[Michel Albert]

Michel Albert added the comment:

I strongly agree with Raymond's points! They are all valid.

I should note, that I submitted this patch to - as mentioned by Nick - familiarise myself with the patch submission process. I decided to make harmless changes which won't risk braking anything.

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