Fix stale volume list for NetApp driver

While contacting filer through DFM in order to create volume from snapshot, the operation may fail with an error "No entry in LUN table for volume". Although the LUN representing the volume was created on the filer, the LUN list was not refreshed in time, which caused an error. This fix handles this situation for creating volume from snapshots"
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Change-Id: I77fff4c36a3af72d28f2d01988a6067919093718