make networks configurable for zmap

[zakkg3]

No description provided.

[ctrlsam]

Thanks for the contribution!

This addition is incredibly helpful to allow users to customise address ranges as well as staying out of "trouble".

There are some formatting errors the pipeline picked up.
You should be able to automatically resolve them by running pre-commit, then I'm happy to get this merged.

pip install pre-commit
pre-commit install
pre-commit run --all-files

[ctrlsam]

lgtm!