logging: replace f-strings in logging calls

Do not unnecessarily format string (eg: when log statement is below current log level).

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Migrated from D4492 (view on Phabricator)

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Patch application report for D4492 (id=15933)

Rebasing onto 5fdda3d1...

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commit 2be0aa2f2b8c46c7e511a8d95a07c3e4550da7a7
Author: Thibault Allançon <haltode@gmail.com>
Date:   Tue Nov 17 14:39:21 2020 +0100

    logging: replace f-strings in logging calls
    
    Do not unnecessarily format string (eg: when log statement is below
    current log level).

See https://jenkins.softwareheritage.org/job/DFUSE/job/tests-on-diff/157/ for more details.

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