Scraper needs update: Bandersnatch stores dists differently now

[awwad]

Bandersnatch (which is what I assume has been used to generate a local mirror of PyPI for users using the scraper for --local execution) has changed in the past few months (somewhere between 1.7 and 1.11, I think). Bandersnatch no longer puts source distributions into directories of the form:
/srv/pypi/web/packages/<firstletter>/<packagename>/<packagename>-<version>.tar.gz

They are now in:
/srv/pypi/web/packages/<irrelevantstring>/<irrelevantstring>/<irrelevantstring>/<packagename>-<version>.tar.gz

Bits of the scraper for --local execution need to be updated, and I need to be careful not to wreck package name & version recognition (because of dashes in package names, for example). /: The relevant thing here is that I no longer have a parent directory name that identifies the package clearly without the ambiguity of version strings.

[awwad]

Can instead scan /srv/pypi/web/simple/<...> for package names, and then run yolk3k: yolk -I 'file:///srv/pypi/web/simple' -V <packagename>

[awwad]

Turns out that if I just strip the source/ subdirectory, I can still use the same logic, since it's an OS walk for .tar.gz files. Trying that. (Er, no, still have to deal with the ambiguity of package names. Again. No, thank you. Yolk it is.)