Avoid misleading messages during "port test"
Avoid misleading messages during "port test"

These messages are caused by an empty temporary package database, so
copy it from the standard one. The messages this makes go away are:

- "does not belong to any package" (from make stage-qa)
- "not registered (normal if it belongs to base)" (fromi
  actual-package-depends)

skreuzer/porttools