Refactor and extract a get_available_slots utility

This adds coverage as well. This will be needed for subsidiary diffs.

Related to swh/infra/sysadm-environment#3367 (closed)

Test Plan

tox

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Migrated from D5846 (view on Phabricator)

Some references in the commit message have been migrated:

• T3367 is now swh/infra/sysadm-environment#3367 (closed)

Build is green

Patch application report for D5846 (id=20905)

Rebasing onto 9d2618db...

Current branch diff-target is up to date.

Changes applied before test

commit 21c4279b9998e884d3b08a8f300c77f608f458b0
Author: Antoine R. Dumont (@ardumont) <ardumont@softwareheritage.org>
Date:   Thu Jun 10 12:15:22 2021 +0200

    Refactor and extract a get_available_slots utility
    
    This adds coverage as well. This will be needed for subsidiary diffs.
    
    Related to swh/infra/sysadm-environment#3367

See https://jenkins.softwareheritage.org/job/DSCH/job/tests-on-diff/360/ for more details.

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Merge request was merged

closed