401 Unauthorized when loading more images from registry

[pfroelke]

When trying to load more images from a generic v2 docker registry, the authorization context seems to get forgotten.
Logging in and the initial load of first 100 images works fine :)

Repro Steps:

1. Login to external docker registry with username and password
2. Click on the registry in the Registries view to expand
3. Scroll down and click on Load More...

Expect:
Loading another 100 images

Actual:
401 Request status

[bwateratmsft]

This might just get automatically fixed when we do #869.

[bwateratmsft]

I'm going to optimistically dupe this one to #869, IMO if the issue still occurs in completely brand-new code then it deserves a new bug to be filed.