Restructure tests

Summary:
Agreed on this in a short meeting, see details in
https://phab.met.no/w/projects/continuous_deployment_for_bora/project_log/

Test Plan: none

Reviewers: borgem, michaeloa, joa, stephenaj, havardf, kimtj

Reviewed By: havardf, kimtj

Differential Revision: https://phab.met.no/D18