powerdns: pass pep8 on selective-answer.py

files/powerdns/selective-answer.py
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They are issues by recent versions of pep8 we are about to land
on Jenkins server :)

Change-Id: I0aaf3fb63d29de983ebae62747e6380ab709718c
Merge "powerdns: pass pep8 on selective-answer.py" into production