fix an error detecting the ppolicy and enable the auxposixgroup schema
- Fix errors on system_packages for newer versions of ansible
- Fix detecting of existing ppolicy overlay on a db (if you apply it twice the server will not start)
- Implement objectClass=auxPosixGroup (because nis.schema provides a definition of posixGroup which is incompatible with groupOfNames, they are both structual classes and posixGroup should really be auxillary)
The other option was to use rfc2307bis to provide gidNumber etc as described here: http://www.openldap.org/lists/openldap-technical/201405/msg00291.html
but this would require a) finding a copy of rfc2307bis (only drafts are available) b) possible incompatabilities with existing nis.schema