Fix iptables missing on Debian 11 if APT::Install-Recommends=0

[rtsp]

What type of PR is this?

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/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

On Debian 11, ipset just "recommend" iptables so on the system that apt is configured with APT::Install-Recommends "0"; iptables will not install automatically.

This PR fix the problem above by explicity tell kubespray to install iptables during preinstall phase.

Which issue(s) this PR fixes:

Fixes #7963

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @rtsp. Thanks for your PR.

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[oomichi]

/ok-to-test
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, rtsp

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