[occm] Add Openstack server hostId as k8s node label

[chess-knight]

What this PR does / why we need it:
Adds OpenStack server hostId to the node labels via the AdditionalLabels feature. It also introduces label name topology.openstack.org/host-id which can be discussed further.

Which issue this PR fixes(if applicable):
fixes #2579

Special notes for reviewers:

Release note:

NONE

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @chess-knight. Thanks for your PR.

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[jichenjc]

/ok-to-test

[anguslees]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: anguslees

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[jichenjc]

/hold

not sure we reach agreement at #2579 already?

[chess-knight]

not sure we reach agreement at #2579 already?

There is almost no activity. I also contacted guys from kubernetes-sigs/cluster-api-provider-openstack#1605

[chess-knight]

/test pull-cloud-provider-openstack-check

[k8s-ci-robot]

PR needs rebase.

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