Adding detect_available_configs support to neovi

[pierreluctg]

No description provided.

[felixdivo]

Looks good so far. After you added the channel(s), please also update #303.

[felixdivo]

The CI tests fail because of this:

neovi_bus.py 26 WARNING You won't be able to use the ICS NeoVi can backend without the python-ics module installed!: No module named 'ics'

Not all libraries are installed by this. Maybe we should simply install all optional packages in tests.

[pierreluctg]

@felixdivo adding python-ics to tests_require is not a problem. However, using it requires have the neovi driver installed (or in the path) this will be problematic.

For now we can simply return a empty list from detect_available_configs if python-ics is unavailable. What do you think?

[felixdivo]

Hm I see. Sounds good.