startproject --template option doesn't support http authentication, neither through .netrc file

[Nahuel]

I'm trying to install project from private repository behind an http basic authentication.

Trying the url authentication schema like ​http://username:password@domain.com/myfile.zip provide an URL parsing error: password is considered as http port.

Trying to use NETRC environment variable or the ~/.netrc file doesn't provide any effect.

This come from the use of urllib.request.urlretrieve there, that doesn't support any kind of authentication:
​https://github.com/django/django/blob/master/django/core/management/templates.py#L262

I think anywhere an URL can be used, django should support http authentication.

[Tim Graham]

Duplicate of #28426.