a88e61959b
We use the url from tox.ini to download the upper constraints and recently that has changed to a redirect and curl doesn't correctly follows redirects by default but stops at the first page. Adding -L option to curl command makes curl follows the redirect until the final location is found and should allow the correct file to be downloaded. Change-Id: I25c724ffe189d414643c910be0ef61c550f802b7