Bug 1793923: [release-4.3] [Baremetal] Haproxy and Keepalived add support for IPv6

[cybertron]

This is a cherry-pick of #1256, and a rebase of the bot PR #1401.

[openshift-ci-robot]

@cybertron: This pull request references Bugzilla bug 1793923, which is invalid:

• expected dependent Bugzilla bug 1793921 to be in one of the following states: VERIFIED, RELEASE_PENDING, CLOSED (ERRATA), but it is ON_QA instead

Comment /bugzilla refresh to re-evaluate validity if changes to the Bugzilla bug are made, or edit the title of this pull request to link to a different bug.

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In response to this:

Bug 1793923: [release-4.3] [Baremetal] Haproxy and Keepalived add support for IPv6

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[kikisdeliveryservice]

let's close the other pr then.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cybertron, kikisdeliveryservice

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[kikisdeliveryservice]

/assign @celebdor

[cybertron]

We discussed this today and I think we no longer need to backport it at all. Sorry for the noise.