[DRE-maint] Bug#606982: redmine: fails to upgrade all instances

[Marc Dequènes (duck)]

Control: forcemerge 606983 -1

Quack,

The conclusion of this bug was that running Redmine as a different users 
was needed. Currently the maintainer scripts enforce the www-data user 
and there is no way to configure this.

For security reasons I think each instance should have its own user, but 
there's some work to make this happen in an automated way.

Regards.

-- 
Marc Dequènes