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If you execute `tests/lock_test.py` or `tox -e integration` on a fairly recent machine, you will get the following error during tests executing against a live Nginx instance: ``` no "ssl_certificate" is defined in server listening on SSL port while SSL handshaking, client: x.x.x.x, server: y:y:y:y:z ``` Indeed, having no defined ssl certificate for a ssl port would inevitably lead to an error during the handshake SSL process between a client and this mis-configured nginx instance. However it was not a problem one year before, because the handshake was not occurring in practice: the test just need to have a nginx started, and then immediately proceed to modify the configuration with a correct SSL setup. And nginx was able to start with a mis-configuration on SSL. But then this fix has been done: https://trac.nginx.org/nginx/ticket/178 Basically with this, validation of the configuration is done during nginx startup, that will refuse to start with invalid configuration on SSL. Consequently, all related tests are failing with a sufficiently up-to-date nginx. For now, it is not seen on Travis because Ubuntu Trusty is used, with an old Nginx. The PR fixes that, by generating on the fly self-signed certificates in the two impacted tests, and pushing the right parameters in the Nginx configuration. * Fix nginx configuration with self-signed certificates generated on the fly * Fix lint/mypy * Fix old cryptography * Unattended openssl * Update lock_test.py