netcontrol: Move Device to API

The UI is highly likely to be using it to retrieve information to display.
core/network.py: fixup in namespaces
WIP - core/control.py: Use `network.MITM`

Update the `Control` class so that it used the recently implemented
`network.MITM`.
WIP - Define Device as a class

So that it IP address and MAC address can have their own underlying logic
and they are clever enough to be retrieved over the network.