Katello/katello — pull request #4891 by stbenjam (2014-12-20 19:39:26+00:00)
Title: fixes #8775 - ensure available errata are unique

The same errata may be in multiple repositories, resulting in duplicate errata:

```
system.available_errata.map(&:errata_id).count = 42
system.available_errata.map(&:errata_id).sort.uniq.count = 26
```