FIX Users removed upon upgrade

FIX the bug that removed the orion user when updating from a previous version.
We have a CHANGES_NEXT_RELEASE file in the directory root that we use to registry each relevant contribution inter-releases (it is useful to generate the changelog for each release).

I think this bugfix worth to be mentioned there. Could you add a "Fix" line in CHANGES_NEXT_RELEASE file, please?