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We add a pydist-overrides to handle cubicweb, as it's not available in
official Debian repositories.

Bump min python2 version along the way.

Since we don't use Crypo module directly.

Currently, this test fails on python3 because mails are not sent
(because of a bug in cubicweb.crypto pending fix [1]) though we at least
ensure that the Fpasswd entity is created.

[1]: https://lists.cubicweb.org/pipermail/cubicweb-devel/2019-May/002913.html

* pytestconf.py is for logilab's pytest, which we do not use anymore.
* realdb_test_forgotpwd.py is broken by an ImportError (at least).

This fixes the following warnings:

  DeprecationWarning: [3.25] __secure__ argument is deprecated
  DeprecationWarning: [3.25] secure argument is deprecated

Accordingly, we now require cubicweb >= 3.25.

Notice that we drop a test case which sole purpose was to check that
things work with https-url option. Since this option does not exist
anymore, the test is now meaningless. On the other hand, we extend the
remaing tests for notification view (test_reset_password) to now check
for the presence of instance URL in sent email.