Autopep8 test/functional/test_runner.py
Autopep8 test/functional/test_runner.py

Summary: Autopep8 test/functional/test_runner.py

Test Plan: check if test/functional/test_runner.py stil works via excuting the functional tests suite

Reviewers: deadalnix, #bitcoin_abc, schancel

Reviewed By: #bitcoin_abc, schancel

Differential Revision: https://reviews.bitcoinabc.org/D857

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