Bug#916204: Improve /etc/lsb-release (or drop it)

[Petter Reinholdtsen <pere@hungry.com>]

[Mike Gabriel]
> we inventory Debian Edu hardware specifics of our customers with the
> tool OCS Inventory. Other than hardware inventorying, the tool also
> looks at /etc/lsb-release and shows the value of the
> DISTRIB_DESCRIPTION field in host lists. If /etc/lsb-release is
> missing, the file /etc/os-release is used.

I would recommend to use the output from "lsb_release -a" instead of
failing to replicate the logic used by lsb_release to figure out the
current status.  On a Debian Edu machine it returns this:

  No LSB modules are available.
  Distributor ID: Debian
  Description:    DebianEdu/Skolelinux
  Release:        9.6
  Codename:       stretch

-- 
Happy hacking
Petter Reinholdtsen