Description of problem:

There are 2 different issues that I believe are at play here.

1. Authentication during discovery is not really working not allowing the discovery of any repositories on private registriers.

2. If/when the query to the v2/_catalog works, the way we're dealing with the results returns nothing for the user at the webUI

Version-Release number of selected component (if applicable):
Satellite 6.13 where I tested but most likely also observed on previous versions

How reproducible:
Always

Steps to Reproduce:
1. Create a private registry that only supports api v2 (anything on azurecr.io, for example). I do have a reproducer for testing purposes I can share.
2. push some images to your private registry
3. try discovering the repositories

Actual results:

1. Discover always return 401 errors (using the right password)

2. If the registry is public, it simply returns no results

Expected results:
Be able to discover container repositories on v2 only registries
Be able to discover container repositories on private registries

Additional info:

I have a possible patch that worked on my lab. Will propose it upstream for discussion/validation.