Porting darknet engine to use Debian's version. The upstream's darknet is using the NNPACK fork. In Debian, the darknet comes from the upstream. Thus we need to port it to use upstream's darknet.
Port to latest python version For the latest python version we got errors to use isdigit on int. So we should avoid using stream_source.isdigit() because it will be an int sometimes. ===================================================================
