tox -e lint is failing

[ocelotl]

Apparently, tox -e lint is failing just starting today. Many isort issues are being reported now in many files. To be able to see these failures I had to delete .tox and run tox -e lint again.

This is weird because it was just not happening before. I am filing this issue just to keep track of this problem, and to be able to associate it with a PR that introduces a fix.

This issue may be just closed if a fix is found that does not require changes on the code.