[MCCS-661] device_under_test fixture

setup.cfg

tests/conftest.py

tests/test_alarm_handler_device.py

tests/test_base_device.py

tests/test_capability_device.py

tests/test_controller_device.py

tests/test_csp_controller.py

tests/test_csp_obs_device.py

tests/test_csp_subarray.py

tests/test_logger_device.py

tests/test_obs_device.py

tests/test_subarray_device.py

tests/test_tel_state_device.py