Avoid the HTTP Error 403: rate limit exceeded error

[krishung5]

This PR fixes the HTTP errors occurring in the L0_model_control_stress test, which were caused by extensive access to torch.hub during model loading

E0423 06:25:10.553733 50667 model_lifecycle.cc:638] failed to load 'resnet50_python' version 1: Internal: HTTPError: HTTP Error 403: rate limit exceeded

At:
  /usr/lib/python3.10/urllib/request.py(643): http_error_default
  /usr/lib/python3.10/urllib/request.py(496): _call_chain
  /usr/lib/python3.10/urllib/request.py(563): error
  /usr/lib/python3.10/urllib/request.py(634): http_response
  /usr/lib/python3.10/urllib/request.py(525): open
  /usr/lib/python3.10/urllib/request.py(216): urlopen
  /usr/local/lib/python3.10/dist-packages/torch/hub.py(164): _read_url
  /usr/local/lib/python3.10/dist-packages/torch/hub.py(181): _validate_not_a_forked_repo
  /usr/local/lib/python3.10/dist-packages/torch/hub.py(222): _get_cache_or_reload
  /usr/local/lib/python3.10/dist-packages/torch/hub.py(555): load
  /opt/tritonserver/qa/L0_model_control_stress/models/resnet50_python/1/model.py(42): initialize

[oandreeva-nv]

Thanks!