Remove tcpip from clean-test dependencies
This is not needed any more since https://gitlab.science.ru.nl/clean-and-itasks/clean-test/commit/42eb64bee4581178549fbc9d145a5da3b6709134.
This is not needed any more since https://gitlab.science.ru.nl/clean-and-itasks/clean-test/commit/42eb64bee4581178549fbc9d145a5da3b6709134.