ac775d3 Add manifest type conversion to skopeo copy

Authored and Committed by dwalsh 6 years ago
     Add manifest type conversion to skopeo copy
     User can select from 3 manifest types: oci, v2s1, or v2s2
      e.g skopeo copy --format v2s1 --compress-blobs docker-archive:alp.tar dir:my-directory
    
        
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