iptables not installed on Debian 11 if apt configured with Install-Recommends=0

[rtsp]

Environment:

• OS: Debian 11 (bullseye)
• Hardware configuration: QEMU-KVM installed with netinst media (without iptables preinstalled)
• Kubespray version (commit): 60853fa

Previously on Debian 10 and earlier, ipset "required" iptables so it's automatically install after running this task.

kubespray/roles/kubernetes/preinstall/tasks/0070-system-packages.yml

Lines 58 to 61 in 35c9287

	- name: Install packages requirements
	package:
	name: "{{ required_pkgs | default([]) | union(common_required_pkgs|default([])) }}"
	state: present

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.

I found that several parts of kubespray is using iptables with the assumption that it's already installed (e.g. Calico, reset.yml) so those part will fail if iptables is missing.