[release-0.10] 🐛 fix: create lbaas in specified subnet

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #2339

/assign lentzi90

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[lentzi90]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lentzi90

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[k8s-ci-robot]

@k8s-infra-cherrypick-robot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-provider-openstack-test	a52ea66	link	true	/test pull-cluster-api-provider-openstack-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[lentzi90]

Manual backport with fix in #2371
/close

[k8s-ci-robot]

@lentzi90: Closed this PR.

In response to this:

Manual backport with fix in #2371
/close

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