Set port as a parameter in the kvp_params.yaml

[mahaarbo]

To be more similar to the RSI parameters. And to not have too much hard coded. Just in case.

[mahaarbo]

This would affect https://github.com/itk-thrivaldi/kuka_kvp_hw_interface primarily

[ivareri]

Not much use for it currently, but it might become more relevant when the source for KUKAVARPROXY is released. I would want a default value for the parameter, so it becomes more optional to set it.