Hetzner public IPv4 and IPv6 configuration

[glehmann]

Which component this PR applies to?

cluster-autoscaler

What type of PR is this?

/kind feature

What this PR does / why we need it:

It lets us use hetzner's new primary IP feature to disable the public IPv4/IPv6 addresses on the nodes

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Added Hetzner public IPv4 and IPv6 configuration.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: glehmann / name: Gaëtan Lehmann (38973aa, bf0882b)

[k8s-ci-robot]

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[gjtempleton]

Tagging in @LKaemmerling based on comments in #3838

@LKaemmerling Are you or someone else from Hetzner able to give this a review?

[LKaemmerling]

This looks fine from my point of view :)

[LKaemmerling]

/assign @aleksandra-malinowska

[gjtempleton]

One more request from me actually @LKaemmerling, is there any chance we could get an OWNERS file set up for the Hetzner cloudprovider in another PR?

It doesn't even need to be member of the k8s org, we can comment out those who aren't members as with the Civo provider: https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/cloudprovider/civo/OWNERS. It'll make it easier for us to get reviews of CloudProvider specific code going forward.

[LKaemmerling]

@gjtempleton of course i will create a PR :)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: feiskyer, glehmann, LKaemmerling

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Needs approval from an approver in each of these files:

• cluster-autoscaler/OWNERS [feiskyer]

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[gjtempleton]

/lgtm