[th/steps-add-nmci]

Python itself is a powerful scripting language.

Currently, we have plenty of scripts (bash, awk, python) under tmp/ and prepare/. A lot of this could be just plain python. Also, we would have a use for a helper library in python, that allow is to implement our behave steps. Of course, all this should be Python, because behave itself is Python. Also, this utility library should be independent of the "nm{cli,tui}/features/steps", because those steps tend to be called by behave (e.g. they have a valid "context").

Add a new "nmci/" module with a few helpers. The idea is to extend that.

@RunTests:*