[cwvreg] load registry using modules names instead of directories
Introspect cubicweb, cubes and apphome using pkgutil to generate the full list
of modules names for loading registries.
Avoiding using bogus logilab.common.modutils.modpath_from_file().
.. _session_module:
:mod:`cubicweb.pyramid.session`
-------------------------------
.. automodule:: cubicweb.pyramid.session
.. autofunction:: includeme
.. autofunction:: CWSessionFactory