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Update test_framework scripts to use the new .format() method

Description

Update test_framework scripts to use the new .format() method

Summary: Avoid using % to format strings, switch to the new method instead.

Test Plan:

./test/functional/test_runner.py --extended

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Subscribers: teamcity, schancel

Differential Revision: https://reviews.bitcoinabc.org/D2576

Details