[pyramid] Call repository's shutdown method atexit
This way when run through a WSGI server (pserve, gunicorn, etc.) we make sure
that the repository is properly shut down. In particular, this would wait for
threads to terminate (otherwise, they'll be killed).
.. _rset_module:
:mod:`cubicweb.rset`
====================
.. automodule:: cubicweb.rset
.. autoclass:: ResultSet
:members: