[occm] KEP-1860: Add support for LoadBalancer ipMode

[kbudde]

What this PR does / why we need it: This PR adds support for ipMode in LoadBalancer status field introduced in KEP-1860. This enables the usage of Proxy Protocol without workaround (EnableIngressHostname + IngressHostnameSuffix).

The workarounds were introducing new issues, e.g. externalDNS was not functional with a loadbalancer with ingress Hostname set.

Which issue this PR fixes(if applicable): There is no open issue as a workaround was introduced.

Special notes for reviewers: Tthe ipMode field is available even if IpMode is still behind a featureGate, so this change could be backported to 1.29.

Release note:

[occm] KEP-1860: Add support for LoadBalancer ipMode

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: kbudde / name: Kris Budde (63bd37411a79dc251aefdc9be79b6e129d74287b, 015fcf15fe9cbb242a05291c95d20c4572ca9913)

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[dulek]

@gryf, you might want to check this out.

[jichenjc]

/ok-to-test

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zetaab

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[zetaab]

we are soonish releasing 1.30 (https://github.com/kubernetes/cloud-provider-openstack/pull/2584) but IMO this could be interesting feature to new release.

cc @dulek @jichenjc

[jichenjc]

/lgtm /hold

@dulek maybe you can check this again before merge

[dulek]

I added a bunch of questions.

[dulek]

/hold cancel