PubCloud:
- Update the way allowed paths are checked
SUMA requested a new feature where it is possible to validate
all versions of the same product and arch (that are allowed to that system)

PubCloud:
- De-register BYOS systems using RMT as a proxy from SCC
- De-activate a single product from a BYOS proxy system

PubCloud:
- Add the handling of the BYOS systems that use RMT as a SCC proxy
In order to do that:
- New boolean column in systems table in db: proxy_byos
- Skip the sync with SCC (using that column)
- Registration of the system to SCC (announce system call and
then use SCC credentials)
- Activation of products
- Check subscription is active/valid for a product/repo to be accessed

- Re-fix broken symlinks: This version fixes the bug-fix