Ensure pylint runs in tests/artifactcache

Benjamin Schubertrequested to merge
bschubert/pylint-artifactcache into master

Description

We used to lack a __init__.py file in tests/artifactcache, so pylint wouldn't run

Changes proposed in this merge request:

  • Adding a __init__.py file in tests/artifactcache
  • Fixing all pylint errors there

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