Fixing idempotency of require_singleuser_auth bash remediation script

[Arden97]

Description:

• Fixing a macro that causes rule's idempotency

Rationale:

• sed command in bash_ensure_ini_config in this particular rule causes replacement of ALL ExecStart with ExecStart=\nExecStart=-/usr/lib/systemd/systemd-sulogin-shell rescue

• additionally /etc/systemd/system/rescue.service.d/10-oscap.conf is being checked more than a single time during the remediation

• in result multiple duplicated ExecStart entries are appended to a file and amount of the additional duplicates is increased after every single run of the remediation script

• this macro should probably not be used to replace multiple entries across the entire file

• Fixes https://issues.redhat.com/browse/RHEL-106811

Review Hints:

• fix in bash_ensure_ini_config is suppose to prevent file changes, in case key=value already exists in the file

[openshift-ci]

Hi @Arden97. 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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[Mab879]

Whitespace errors.