Move VNF-Onboarding classes into a separate directory

This is a temporary solution to isolate vnf-pipelines related
reclass resources without moving them to a separate repo. It's
not feasible for now to completely decouple them from
system-reclass but it will happen in Q4.

Closes-Bug: PROD-22573

Change-Id: I8a770fb251fe4f77072cb107658db824f7039909
29 files changed