Automated cherry pick of #8599: Properly detect that bpffs has been mounted

[olemarkus]

Cherry pick of #8599 on release-1.15.

#8599: Properly detect that bpffs has been mounted

For details on the cherry pick process, see the cherry pick requests page.

[k8s-ci-robot]

Hi @olemarkus. Thanks for your PR.

I'm waiting for a kubernetes 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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[hakman]

/ok-to-test

[olemarkus]

/retest

[johngmyers]

/retest

[justinsb]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: justinsb, olemarkus

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