🌱 Add Metal3 as an IPAMProvider

[peppi-lotta]

What this PR does / why we need it:
🌱 clusterctl: add metal3 ipam provider

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

[peppi-lotta]

/area clusterctl

[k8s-ci-robot]

Hi @peppi-lotta. 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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[sbueringer]

Thank you!

/ok-to-test
/lgtm
/approve

/cherry-pick release-1.11

[k8s-infra-cherrypick-robot]

@sbueringer: once the present PR merges, I will cherry-pick it on top of release-1.11 in a new PR and assign it to you.

In response to this:

Thank you!

/ok-to-test
/lgtm
/approve

/cherry-pick release-1.11

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 46c1b3ce98b2d7cfd37e115affe1a5392382b117

[sbueringer]

/hold
Needs a small test fix

[peppi-lotta]

@sbueringer I had missed some of the test related changes. Those are now added :)

[sbueringer]

Thank you!

/lgtm
/approve
/hold cancel

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 0ff0d5121eb9fd1843157def0dabf6eaf5b8bde7

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[sbueringer]

/cherr-pick release-1.11

[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #12760

In response to this:

Thank you!

/ok-to-test
/lgtm
/approve

/cherry-pick release-1.11

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.