Loosen up IP validation

[TXSteve2019]

Love the graphical representation you've created for iperf3, I have a MAJOR use of this for demo purposes but when attempting to speak to other devices over typical non-routable IP assignments such as: 6.7.8.9 or 3.3.3.3; the python checks are invalidating the entries and not allowing the communication to work for graphical representation.

Are you interested in loosing these checks so any network interface on host can be used along with ANY numeric IP assignment given, regardless if it passes RFC guidelines?

Or maybe guide me on where in the python code to remove the IP checks?

Thanks!