t/test_cli.py: port setup/teardown to pytest 8. #87
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As pointed out in Debian bugs #1063943 and then #1071794, test/test_cli.py fails with pytest 8 and beyon with the following symptoms:
This is because pytest 8 deprecated the use of plain setup and teardown, which were compatibility layers to ease the porting effort from Nose. This change ensures methods inheriting from CliTest get set up and teared down properly.