node: Add capability check in NodeStageVolume

[darkowlzz]

This fixes the csi-sanity failures for hostpath driver.

Node Service
  NodeStageVolume
    should fail when no volume capability is provided [It]

    Expected an error to have occurred.  Got:
        <nil>: nil

[k8s-ci-robot]

Hi @darkowlzz. Thanks for your PR.

I'm waiting for a kubernetes-csi or kubernetes 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.

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[pohly]

/ok-to-test

[pohly]

/lgtm

I ran the csi-sanity test against the patched hostpath in and can confirm that this makes the driver pass the sanity testing.

@jsafrane please approve.

[jsafrane]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: darkowlzz, jsafrane

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