Fix grub2_bootloader_argument to check /etc/default/grub.d on Ubuntu

[mpurg]

Description:

• Modify OVAL in grub2_bootloader_argument template to also check the configs in /etc/default/grub.d on Ubuntu
• Add and fix ubuntu tests

Rationale:

• The old OVAL checked the compiled config in /boot and the config in /etc/default/grub, but not the configs /etc/default/grub.d/*.cfg, which are also sourced when running grub-mkconfig.
• Fixes https://bugs.launchpad.net/usg/+bug/2053240

[openshift-ci]

Hi @mpurg. Thanks for your PR.

I'm waiting for a ComplianceAsCode member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[github-actions]

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

Fedora Environment

Oracle Linux 8 Environment

[github-actions]

🤖 A k8s content image for this PR is available at:
ghcr.io/complianceascode/k8scontent:11612

Click here to see how to deploy it

If you alread have Compliance Operator deployed:
utils/build_ds_container.py -i ghcr.io/complianceascode/k8scontent:11612

Otherwise deploy the content and operator together by checking out ComplianceAsCode/compliance-operator and:
CONTENT_IMAGE=ghcr.io/complianceascode/k8scontent:11612 make deploy-local

[codeclimate]

Code Climate has analyzed commit b0e1885 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 58.1% (0.0% change).

View more on Code Climate.

[dodys]

lgtm, thanks!