WIP: do not ingore error when validating cgroup controllers

[harche]

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[openshift-ci-robot]

@harche: the contents of this pull request could not be automatically validated.

The following commits could not be validated and must be approved by a top-level approver:

• 799f120|do not ingore error when validating cgroup controllers: does not specify an upstream backport in the commit message

Comment /validate-backports to re-evaluate validity of the upstream PRs, for example when they are merged upstream.

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