[2.12] kube-proxy need conntrack (#5478)

[champtar]

What type of PR is this?
/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:
None

Special notes for your reviewer:
cherry picked from commit 48c41bc

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @champtar. Thanks for your PR.

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[Miouge1]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: champtar, Miouge1

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