Porting to OpenVINO 2021.4

[mvasquez1981]

Hi, we need to use this code with OpenVINO 2021.4, do you have plans to do this or what would be your advise? We observe errors like this because of the changes of OpenVINO APIs:

Traceback (most recent call last):
File "people_counter.py", line 228, in
main()
File "people_counter.py", line 139, in main
cur_request_id, args.cpu_extension)[1]
File "/home/mvasquez/dev/openvino/people-counter-python/application/inference.py", line 79, in load_model
[l for l in self.net.layers.keys() if l not in supported_layers]
AttributeError: 'openvino.inference_engine.ie_api.IENetwork' object has no attribute 'layers'

Regards,
Miguel Vasquez