PyTorch slice fixes

Jay Shingala requested to merge pytorch_slice_fixes into dev_v7

This merge request has the following changes:

  1. Bug fix in sadl/layer_slice.h. Modifications for the model's slice layer-specific variables are prevented. Using local variables instead.
  2. Support onnx to SADL conversion for slice layers from PyTorch.
  3. Test model has been added to utests/models directory. It is present at utests/models/ of onnx model) and utests/models/slice_chw_pytorch.onnx.
  4. utests/ has been modified for the new slice_chw_pytorch.onnx model.

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