[auth] Make the configuration cookies completely configurable
Also transfert the secret setting from all-in-one.conf to pyramid.ini,
with backward compatibility.
Closes #5999625
.. _authplugin_module:
:mod:`pyramid_cubicweb.authplugin`
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.. automodule:: pyramid_cubicweb.authplugin
.. autoclass:: DirectAuthentifier
:show-inheritance:
:members: