Samples: Add Dell PowerMax ISCSI backend samples

[jproque-dell]

No description provided.

[openshift-ci]

Hi @jproque-dell. Thanks for your PR.

I'm waiting for a openstack-k8s-operators member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[Akrog]

Thank you for submitting a new backend sample.

Please add your driver to the list of available cinder backend samples (https://github.com/openstack-k8s-operators/cinder-operator/tree/main/config/samples/backends) and squash the PR commits into a single commit.

Review note: There is no need for a custom container even though the driver has OpenSSL python package as a dependency because the cinder-volume container already includes it.

[Akrog]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Akrog, jproque-dell

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