'puppet module install --module_repository' never finishes

When I add `–module_repository https://artifactory.<mydomain>.com/api/puppet/puppet-forge` to my fixtures, my unit tests just hang forever.

When I run  `puppet module install puppetlabs/stdlib --debug --module_repository  https://artifactory.<mydomain>.com/api/puppet/puppet-forge` on puppet 6.10.1 directly, or on 6.10.1 or 6.11.1 via pdk bundle exec, I see the following:

```

Debug: HTTP GET https://artifactory.<mydomain>.com/api/puppet/puppet-forge/api/puppet/puppet-forge/v3/releases?limit=20&offset=20

Debug: HTTP GET https://artifactory.<mydomain>.com/api/puppet/puppet-forge/api/puppet/puppet-forge/v3/releases?limit=20&offset=20

Debug: HTTP GET https://artifactory.<mydomain>.com/api/puppet/puppet-forge/api/puppet/puppet-forge/v3/releases?limit=20&offset=20

```

repeating until I kill it.

If I use `–module_repository https://artifactory.<mydomain>.com`, then I get a 404 with it trying the URL https://artifactory.<mydomain>.com/v3/releases?module=pupetlabs-stdlib&sort_by=version&exclude_fields=readme%2Cchangelog%2Clicense%2Curi%2Cmodule%2Ctags%2Csupported%2Cdownlaods%2Ccreated_at%2Cupdated_at%2Cdeleted_at
```

I've set this up using a combination of Artifactory documentation, and the documentation for puppet and puppet_spec_helper, but have not been able to get it to install  modules from my local Artifactory based forge. (FWIW, I have r10k installing modules from it successfully)