Fix handling of grub.d configs in grub2_bootloader_argument

[mpurg]

Description:

• Fixed failing check on Ubuntu when grub parameters were defined in /etc/default/grub.d/*cfg but not in /etc/default/grub.
• The fixed oval now checks for the existence of the parameter in either /etc/default/grub or at least one
  /etc/default/grub.d/*cfg, ignoring loading order or overriden values.

Rationale:

• Fixes change introduced in PR Fix grub2_bootloader_argument to check /etc/default/grub.d on Ubuntu #11612
• We can avoid the added complexity of checking the loading order and potentially overridden GRUB_CMDLINE_LINUX variables, because the tests with /etc/default/grub* are redundant to begin with. The OVAL checks also the parameters in the generated grub configs in /boot (as prescribed by CIS 1.0.0 for Ubuntu 22.04).

[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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[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:11726
This image was built from commit: 62dafb1

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If you alread have Compliance Operator deployed:
utils/build_ds_container.py -i ghcr.io/complianceascode/k8scontent:11726

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CONTENT_IMAGE=ghcr.io/complianceascode/k8scontent:11726 make deploy-local

[codeclimate]

Code Climate has analyzed commit 62dafb1 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 59.3% (0.0% change).

View more on Code Climate.

[dodys]

lgtm, thanks!