Turns out that the pyln-proto dependency in the bolt packages is only
needed for testing, not for production. Making it a dev-dependency
means it isn't considered in resolution anymore.
Since the bolt, testing and client packages are to be used outside
from the project we can't use relative dependencies either, so make
then dependent on the version on PyPI. This also means we had to push
a couple of updated to PyPI.
Changelog-None
Christian Decker