[whitepaper][1.5.4]: Comments on legacy VNF-s

I have serious doubts that we can run "legacy VNF-s" (let's assume, that these are legacy because of their need for CPU pinning, NUMA alignement, SR-IOV or even PCI passthrough) using KubeVirt or Virtlet. It is possible to run these with OpenStack and yes it is possible to run these with an OpenStack on top of Kubernetes, but I think it is a too big simplification to say that OpenStack is an abstraction layer. It is an other orchestrator layer for "legacy VNF-s" on top of the orchestration layer for CNF-s.

Locate the whitepaper section identified as 1.5.4 and read its discussion of legacy VNFs, KubeVirt, Virtlet, and OpenStack. Compare the section's abstraction-layer claim with the concerns raised here, then determine and document the specific wording or scope changes needed; the issue does not define a concrete completion condition.

Written by the indexing model from the issue text.