[release-0.11] Fix panic when OpenStack server is deleted by an external agent

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #2475

/assign mnaser

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[k8s-ci-robot]

@k8s-infra-cherrypick-robot: The following tests 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-build	f350b6c5a690af96be9f7744fe1dbfa5be33b6af	link	true	/test pull-cluster-api-provider-openstack-build
pull-cluster-api-provider-openstack-e2e-test	f350b6c5a690af96be9f7744fe1dbfa5be33b6af	link	true	/test pull-cluster-api-provider-openstack-e2e-test
pull-cluster-api-provider-openstack-test	f350b6c5a690af96be9f7744fe1dbfa5be33b6af	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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[EmilienM]

this will need a manual cherry-pick :confused:

[EmilienM]

@mdbooth could you help with this backport please?

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/lifecycle stale

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/lifecycle rotten

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closed this PR.

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/close

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