DevPi - Different scopes cause 404 errors

Symptoms: Some packages work in DevPi remote repositories, while others fail with 404 errors.

It looks like there is a problem with handling mixed package scopes in DevPi repositories.

Public DevPi Example (Visit the URL in a browser) - https://m.devpi.net/carljm/dev/+simple/example/

carljm/dev example-1.0.tar.gz <- Works
root/pypi example-0.1.0.tar.gz <- 404 Not Found

Artifactory is appending on the "root/pypi" to the download path, when it should not:

http://artifactory.com:8081/artifactory/api/pypi/devpi-test/packages/root/pypi/+f/f58/73e6ec8417764/example-0.1.0.tar.gz#sha256=f5873e6ec841776497c0d42a5153f84c2f12fa68ea4d77be1467e8b9a9ffc3bb

VS

http://pat.vm:8081/artifactory/api/pypi/devpi-test/packages/+f/a8f/f8d23246e26cb/example-1.0.tar.gz#sha256=a8ff8d23246e26cb6e60d7d25f659249020cd6c18235d187ffc065d1a6b06123

This is a problem because most DevPi repositories will mix their scopes. Artifactory needs to support this otherwise most DevPi packages cannot be downloaded.

Steps to reproduce:

1. Set up a remote PyPi repository to the public m.devpi.net repository, and use the custom "carljim/dev" scope
2. Attempt to download the "example" 0.1.0 package, not the latest 1.0 package:

pip install example==0.1.0
Looking in indexes: http://localhost:8081/artifactory/api/pypi/devpi-test/simple
Collecting example==0.1.0
HTTP error 404 while getting http://localhost:8081/artifactory/api/pypi/devpi-test/packages/root/pypi/+f/f58/73e6ec8417764/example-0.1.0.tar.gz#sha256=f5873e6ec841776497c0d42a5153f84c2f12fa68ea4d77be1467e8b9a9ffc3bb (from http://localhost:8081/artifactory/api/pypi/devpi-test/simple/example/)
Could not install requirement example==0.1.0 from http://localhost:8081/artifactory/api/pypi/devpi-test/packages/root/pypi/+f/f58/73e6ec8417764/example-0.1.0.tar.gz#sha256=f5873e6ec841776497c0d42a5153f84c2f12fa68ea4d77be1467e8b9a9ffc3bb because of error 404 Client Error: Not Found for url: http://localhost:8081/artifactory/api/pypi/devpi-test/packages/root/pypi/+f/f58/73e6ec8417764/example-0.1.0.tar.gz
Could not install requirement example==0.1.0 from http://localhost:8081/artifactory/api/pypi/devpi-test/packages/root/pypi/+f/f58/73e6ec8417764/example-0.1.0.tar.gz#sha256=f5873e6ec841776497c0d42a5153f84c2f12fa68ea4d77be1467e8b9a9ffc3bb because of HTTP error 404 Client Error: Not Found for url: http://localhost:8081/artifactory/api/pypi/devpi-test/packages/root/pypi/+f/f58/73e6ec8417764/example-0.1.0.tar.gz for URL http://localhost:8081/artifactory/api/pypi/devpi-test/packages/root/pypi/+f/f58/73e6ec8417764/example-0.1.0.tar.gz#sha256=f5873e6ec841776497c0d42a5153f84c2f12fa68ea4d77be1467e8b9a9ffc3bb (from http://localhost:8081/artifactory/api/pypi/devpi-test/simple/example/)

20191017190118|770|REQUEST|127.0.0.1|admin|GET|/api/pypi/devpi-test/packages/root/pypi/+f/f58/73e6ec8417764/example-0.1.0.tar.gz|HTTP/1.1|404|0