fix openstack-placement with nixpkg update

[pkr4711]

python workaround must be removed after nixpkg
update from 2026-06-08 -> 2026-07-30

Summary by CodeRabbit

• Chores
  • Simplified package test execution by running tests directly for more efficient test runs.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: df978eae-aec3-44f5-b983-acf6fcef485d

📥 Commits

Reviewing files that changed from the base of the PR and between a745902 and 57dc054.

⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• packages/openstack-placement.nix

💤 Files with no reviewable changes (1)

• packages/openstack-placement.nix

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📝 Walkthrough

Walkthrough

The package test phase no longer modifies the test file. Tests now run directly with stestr run.

Changes

Cohort / File(s)	Summary
Placement test execution packages/openstack-placement.nix	Removes the substitution that changed the expected "choose from 'db'" text before running stestr run.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: hertrste

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title references fixing openstack-placement for a nixpkg update, which aligns with the PR objective to update the package for the Nixpkgs update from 2026-06-08 to 2026-07-30.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-os-placement

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