[release-1.30] [occm] add a node selector support for loadbalancer services

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #2601

/assign kayrus

added a node selector support for loadbalancer services

[jichenjc]

I assume we are lack of 1.30 CI test now..suggest to create that first before we merge this PR

/lgtm /hold

[dulek]

/approve

CI's running now, let's unhold once it passes.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dulek

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[kayrus]

it's green :tada: /unhold

[kayrus]

/hold

[kayrus]

@jichenjc do we need to wait for https://github.com/kubernetes/cloud-provider-openstack/issues/2606 ?

[jichenjc]

@jichenjc do we need to wait for https://github.com/kubernetes/cloud-provider-openstack/issues/2606 ?

I can't see the history now , originally 1.30 only test UT but no functional CI test 2606 added CI for 1.30 so should able to test 1.30 after that as no CI history from here can be seen might need keep an eye