CSI Sanity Check

https://github.com/longhorn/longhorn/issues/2076

Run csi-sanity

  1. Prepare Longhorn cluster and setup backup target.

  2. Make csi-sanity binary from csi-test.

  3. On one of the cluster node, run csi-sanity binary.

    csi-sanity -csi.endpoint /var/lib/kubelet/obsoleted-longhorn-plugins/driver.longhorn.io/csi.sock -ginkgo.skip="should create volume from an existing source snapshot|should return appropriate values|should succeed when creating snapshot with maximum-length name|should succeed when requesting to create a snapshot with already existing name and same source volume ID|should fail when requesting to create a snapshot with already existing name and different source volume ID"

    NOTE

    The skipped tests will be tracked by #2271.

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