Ensure default StorageClass reclaimPolicy is set to nil instead of emptystring when reclaim_policy undefined

[wongma7]

Attempt to fix #9340 again.

Thank you Clayton for finding ansible/ansible#44503. I've added to the integration to ensure that reclaim_policy: "{{ undefined_variable | default(omit, True) }}" results in storageClass.reclaimPolicy being nil then defaulted by openshift to Delete. I am still figuring out how to test this with ansible locally but the integration test will suffice in the meantime I tested it locally and it works as expected.

[wongma7]

do the integration tests run with CI? doesn't look like it

[vrutkovs]

/lgtm

Integration tests are being run, see ci/prow/gcp

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vrutkovs, wongma7

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[wongma7]

/cherrypick release-3.10

[openshift-cherrypick-robot]

@wongma7: new pull request created: #9810

In response to this:

/cherrypick release-3.10

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