fix: Ignore released volumes when deleting a node

[willthames]

Fixes #1684

Description

Ignore released volumes when waiting for volume attachments

When deciding whether a node can be terminated, ignore persistent
volumes that have already been released (perhaps attached to a pod
that has since been drained)

How was this change tested?

Using make test. This change is split into two commits, the first is a test that fails before the change in the second commit and succeeds afterwards

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[k8s-ci-robot]

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This pull-request has been approved by: willthames
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[k8s-ci-robot]

Hi @willthames. Thanks for your PR.

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