resnet50-v2-7.onnx file path not found

[bpickrel]

Describe the bug The model file resnet50-v2-7.onnx was not found in the location expected by script migraphx_resnet.py The default location used by the script was apparently not updated to reflect a change in the proteus get code.

To Reproduce Steps to reproduce the behavior:

1. start docker container
2. proteus get
3. start the server
4. python3 examples/python/migraphx_resnet.py

waiting for server...ok.
Loading model to verify data shape...
Traceback (most recent call last):
  File "examples/python/migraphx_resnet.py", line 343, in <module>
    main(args)
  File "examples/python/migraphx_resnet.py", line 197, in main
    model = onnx.load(modelname)
  File "/usr/local/lib/python3.6/dist-packages/onnx/__init__.py", line 115, in load_model
    s = _load_bytes(f)
  File "/usr/local/lib/python3.6/dist-packages/onnx/__init__.py", line 29, in _load_bytes
    with open(cast(str, f), 'rb') as readable:
FileNotFoundError: [Errno 2] No such file or directory: '/workspace/proteus/external/artifacts/onnx/resnet50v2/resnet50-v2-7.onnx'

[varunsh-xilinx]

85 is fixing this as part of the examples overhaul

[varunsh-xilinx]

Fixed in #85