BF: Fix error detecting eyetracker config files

[TEParsons]

Fixes #5880

[TEParsons]

Task linked: CU-8692knauh Eyetracker: AttributeError: (<psychopy.iohub.client.ioHubDeviceView object at 0x7f9362064f70>, 'runSetupProcedure') with Tobii plugged in

[peircej]

JWP: I'm concerned that import __file__ from one file to another might do BadThings:tm:. Suggesting this instead (which @mdcutone will implement/test)

Todds:

psychopy/iohub/devices/eyetracker/hw/gazepoint/init.py

from psychopy_eyetracker_tobii.tobii import __file__

in psychopy/iohub/devices/deviceConfigValidation.py

    validation_module = importlib.import_module(relative_module_path)
    validation_dir_path = os.path.dirname(validation_module.__file__)
    # get config file from subdiretory path
    validation_file_path = os.path.join(validation_dir_path,
                                        'supported_config_settings_{0}.yaml'.format(device_class_name.lower()))

suggested:

in psychopy/iohub/devices/eyetracker/hw/tobii/init.py

from psychopy_eyetracker_tobii import tobii
import pathlib
yaml_file = pathlib.Path(tobii.__file__).parent / 'supported_config_settings_{0}.yaml'.format(device_class_name.lower())

in psychopy/iohub/devices/deviceConfigValidation.py

validation_module = importlib.import_module(relative_module_path)
validation_file_path = validation_module.yaml_file