conftest: Use module's get_<storage-backend> to instantiate backend
Instead of directly import the storage backend whose name could change.
This fixes the ci build [1]
[1] https://jenkins.softwareheritage.org/job/DCIDX/job/tests/817/console
ardumont | Authored on Jan 31 2020, 9:33 AM |
ardumont | Pushed on Jan 31 2020, 12:02 PM |
Buildable 10395 | |
Build 15467: test-and-build | Jenkins |