Allow tests/test_product_stability.py to be executed

[Mab879]

Description:

Allow tests/test_product_stability.py to be executed directly.

Rationale:

In the output it gives an example of how to update the data.
This PR makes it so the example can be used without modification.

Example output

If changes to mentioned products are intentional, execute this script with PYTHONPATH set to the project root to regenerate reference products:
/home/mburket/ComplianceAsCode/content/tests/test_product_stability.py --update-reference-data /home/mburket/ComplianceAsCode/content/products /home/mburket/ComplianceAsCode/content/tests/data/product_stability
If those changes are unwanted, take a look at product properties that likely cause these changes.

Review Hints:

./tests/test_product_stability.py

[github-actions]

Start a new ephemeral environment with changes proposed in this pull request:

Fedora Environment

Oracle Linux 8 Environment

[codeclimate]

Code Climate has analyzed commit 9ee2b83 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 58.5% (0.0% change).

View more on Code Climate.

[jan-cerny]

I confirm that the script is executable now.

[jan-cerny]

/packit retest-failed