cache: adds debug details about what the content of the update
Having more data in debug is good, we add a small method to help providing them.
This code was headed for core during the 4.3 cycle but never made it there. So
we starts with a copy in the evolve repository.
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)