[test] Increase robustness of test scripts

Alexander Jaustrequested to merge
test-scripts-robustness into develop

Description

Newer versions of DuMuX have renamed some of the functions in their Python test scripts (compare_vtk -> compareVTK). The changes in this commit increase the robustness of the tests we run. The import of DuMuX' test scripts are guarded by try/except block.

Checklist

  • I made sure that the source files are formatted properly.
  • I added my changes to the changelog (CHANGELOG.md)
  • I updated the documentation. No change needed.

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