[OE-core] How to migrate from PRINC to PR_SERVER?

[Mike Looijmans]

Attempting to move to the current OE-head now yields about a hundred 
messages like this:

WARNING: Use of PRINC 7 was detected in the recipe ...

The https://wiki.yoctoproject.org/wiki/PR_Service page tells what the PR 
server is.

However, it does not tell what to do with the recipes. Just removing 
PRINC from the recipes will break the upgrade path.

What are we supposed to do now?

-- 
Mike Looijmans