Unexpected change to server model in benchmark

[LuckMonkeys]

Hi

In breaching.analysis.report() function, it directly uses the server.model to load the parameters and buffers. However, this may cause wrong modification to server.model and influences the next run in benchmark. It may be possible to resolve the problem by adding model=copy.deepcopy(model) before model.to(**setup)

    model = copy.deepcopy(model)
    model.to(**setup) 

[JonasGeiping]

I didn't have this issue so far, but a fix is now included, just in case: 4061351.

Thanks for sharing!