Update testing framework alsatian to 3.0.x

[shiqimei]

The new version of alsatian brings more awesome features like logging.

@graywolf336 @d-gubert Can we make plans for updating this dependency?

[d-gubert]

I think this is a good idea.

A good first step is to update Alsatian and run the tests - if they break, we can measure the effort of solving the problems; if everything works, we're good to go :)