Bugfix #1666 break access to index urls that include auth

[tjarls]

The fix for issue #1666 breaks with urls that include a username and password. Here's an illustration of how it breaks:

$ easy_install -i https://user:password@pypi.example.org/simple/install example
Searching for example
Reading https://user:password@pypi.example.org/simple/install/example/
Download error on https://user:password@pypi.example.org/simple/install/example/: nonnumeric port: 'password@pypi.example.org' -- Some packages may not be found!

[pganssle]

Was this intentional @jaraco? I got the general sense that some support was maybe being dropped in those original PRs, but I don't think it was marked as a breaking change, right?

In any case, @tjarls, does this happen only when you invoke via easy_install? Can you solve your issue by using pip directly? This entire pathway is deprecated and is largely being maintained to "best effort" standards. I think it's definitely a bug if it's breaking backwards compatibility, but it would be good to get a sense of where to prioritize it.

[jaraco]

It was not intentional.