Hi,
attached are patches for preupgrade-assistant and preupgrade-assistant-content to better recognized CentOS and it's packages.
With these patches applied preupgrade no longer recognize packages signed by CentOS as 3rd party. This also applies all files owned by the packages.
Also the assessment is renamed from RHEL6_7 to CentOS6_7. So please run preupg with "-s CentOS6_7".
The test results on my development machine now look fine. No more failed checks, false positives or negatives. So next thing I'll work on is the branding.
cheers, manuel