tests: Move conftest.py into tests/ subdirectory

Tristan Van Berkomrequested to merge
tristan/move-conftest-into-tests into master

Pytest implicitly loads this file from the CWD where it runs, which is usually the project toplevel directory, but also supports loading it from the tests/ subdirectory where tests are run from.

Placing it into the tests/ subdirectory is not perfectly explicit, but is at least a hint to the unsuspecting developer that this file is related to tests.

Merge request reports