So far we couldn't depend on proper versions as they had not been
released yet. Now they do, so we can add the respective dependencies
Change-Id: I0573a151f55488599a01ea9dfdcfa02396cd6c35
We don't want osmo-cbc to depend on python3 at runtime, so let's use
a sub-package for osmo-cbc-apitool.py
Change-Id: Id16613811993a2baa06ebc2da6c6591ace70a3f9