We do this to make it easier to control this value during testing. We
should not import these values at package setup time. Nor should we
import them at package load time.
This change introduces a new API for the Moulinette package. The
moulinette.env accessor. This is a breaking change. However, I've
searched around and can't seem to find any usage that relies directly on
these properties being available.
I've tried to maintain API backwards compatibility in all cases
otherwise.