Remove Ubuntu oval and remediation for nftables_rules_permanent

[mpurg]

Description:

• Remove Ubuntu oval and remediation for nftables_rules_permanent

Rationale:

• Existing ubuntu OVAL checks only whether configuration files are
  included in /etc/nftables.conf, and whether they are not empty.
  It doesn't check for actual contents, giving a false sense of
  correctness when the check passes.
• The Ubuntu CIS recommendations require that the content matches
  local site policy, which is not possible to automate, thus
  removing the audit and remediation.

[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

[codeclimate]

Code Climate has analyzed commit 5a1fb41 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 60.9% (0.0% change).

View more on Code Climate.

[dodys]

@jan-cerny we will revert this. It shouldn't have been merged since this is still automated according to CIS and any change to it should be discussed with them previously. Therefore removing this experience from users, specially those running 20.04 or 22.04 is not worth it right now, until then we should keep as-is.