[DRAFT] distroless-iptables: remove dependency from conntrack binary

[aroradaman]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

With kubernetes/kubernetes#126847 kube-proxy will no longer depend on conntrack binary to be present on the image, this PR removes the conntrack binary from the distroless-iptables image.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

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This pull-request has been approved by: aroradaman
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[danwinship]

This image is versioned separately from kubernetes, and I think it's possible for an older kube-proxy image to get built against a newer distroless-iptables image (eg if we have to fix a security problem in the base image). So I think we need to keep conntrack there?

/cc @BenTheElder

[aroradaman]

/hold till all the versions don't depend on conntrack.
(ref: kubernetes/kubernetes#126847 (comment))