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Why? Because we do not support anymore older versions (and so
don't test on its). Python 2 is currently kept for a project
client, but it will not last, to ease maintenance and encourage
to upgrade to have new features.

For now the test cannot pass because they require cubicweb stack which is not
available in our repository used at build time.

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

Bump min python2 version along the way.

AFAIK, we don't need this anymore.

But exclude debian directory since I don't understand why we would
need it in the sdist.

Since 2.8, psycopg2 errors have been extended to support all postgresql
specifics errors:
http://initd.org/psycopg/docs/news.html#what-s-new-in-psycopg-2-8

Keep backward compatibility of tests with psycopg2<2.8 since we may want to run tests (e.g. debian packages) with older psycopg2.