Debian policy fixes

- Made sure to include both companies AND individuals in AUTHORS file.
- Fixed a copyright issue on kernelrt plugin which is GPL-2 and not GPL-2 (or later)
- Treat the sosreport package as a private python module (currently a public one
  as defined by the Debian python policy)

Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>
Added copyright and author additions from my feature branch

Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>