Added variables cilium_enable_host_firewall and cilium_policy_audit_mode for configmap/cilium-config

[ledroide]

What type of PR is this?

/kind feature

Special notes for your reviewer:

In order to enable (Cilium Host Firewall](https://docs.cilium.io/en/latest/security/host-firewall/) and the recommended PolicyAuditMode that prevents unwanted side effects during testing, we have added 2 variables to cilium role and to inventory (features are disabled by default) :

cilium_enable_host_firewall: false
cilium_policy_audit_mode: false

These features are then added in ConfigMap/cilium-config by cilium role - here set to "true" for the demo. Quotes and capitalized values in this configmap are required.

enable-host-firewall: "True"
policy-audit-mode: "False"

We have added related documentation in docs/cilium.md

Does this PR introduce a user-facing change?:

No facing change. Default settings are set to "false", so there is no difference to cilium behavior when keeping default values.

Add optional support for _Host Firewall_ and _PolicyAuditMode_ features in Cilium

[k8s-ci-robot]

Hi @ledroide. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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.

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[ledroide]

The pipeline failed a week ago with error messages that do not have any relation with the changes of this PR.

How can I force these checks to run again ?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ledroide
Once this PR has been reviewed and has the lgtm label, please assign floryut for approval. For more information see the Kubernetes Code Review Process.

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[ledroide]

Hello dear reviewers Arthur and Erik @MrFreezeex @ErikJiang.

Since I have pushed this PR a month ago, the check does not pass a test stage with error ci-not-authorized. It looks like I can't do anything about this error.

I had already tried the same changes in March, ref #10989 , and tried solve it by cancelling the first PR and open this one - unfortunately with no more success.

May you please test and approve this PR ?

[yankay]

/ok-to-test