[bug] Custom kwargs in serve_private_file URL pattern

[Gagan Deep]

Similar to openwisp/openwisp-firmware-upgrader#197

We have used custom URL kwarg in the serve_private_file URL.

openwisp-radius/openwisp_radius/private_storage/urls.py

Lines 9 to 16 in ec45ea2

 def get_private_store_urls(): 
     return [ 
         path( 
             urljoin(app_settings.CSV_URL_PATH, '<path:csvfile>'), 
             views.rad_batch_csv_download_view, 
             name='serve_private_file', 
         ) 
     ] 

openwisp-radius/openwisp_radius/private_storage/views.py

Lines 7 to 12 in ec45ea2

 class RadiusBatchCsvDownloadView(PrivateStorageDetailView): 
     storage = _get_csv_file_private_storage 
     model = load_model('RadiusBatch') 
     model_file_field = 'csvfile' 
     slug_field = 'csvfile' 
     slug_url_kwarg = 'csvfile' 

This breaks the functionality of PrivateS3BotoStorage which uses this URL with path keyword argument. We should change csvfile to path for consistency with private_storage module.

https://github.com/edoburu/django-private-storage/blob/cfe1e62e2458798760fe6f6c9825e2f663d25ac1/private_storage/storage/s3boto3.py#L58-L64