Scrub multiple ways of describing index-url from requiremnts.txt when using vendored installs (#544)
Scrub multiple ways of describing index-url from requiremnts.txt when using vendored installs (#544)

See https://github.com/pypa/pip/issues/11276 for the upstream problem.
A fix was already in-place in the python buildback, but it was limited
to a single notation of `index-url=...`
cloudfoundry/python-buildpack,cloudfoundry/python-buildpack,cloudfoundry/python-buildpack