uwsgi: Do not autoload modules
uwsgi: Do not autoload modules

We used to use uWSGI in emperor mode, which would run Ideascube as
follows:

  /usr/bin/uwsgi --ini ideascube.ini

But with the latest packaging changes, we moved to using plain uWSGI as
it is packaged in Debian, which runs Ideascube with this command:

  /usr/bin/uwsgi --ini /usr/share/uwsgi/conf/default.ini \
                 --ini /etc/uwsgi/apps-enabled/ideascube.ini

The default.ini configuration file has the following line:

  autoload = true

What happens with this is that when uWSGI parses ideascube.ini, it finds
this line first:

  module = ideascube.wsgi

At this point, uWSGI doesn't know how to interpret this `module` option,
so it searches for a plugin that knows. It finds the `python` plugin and
loads it, even though later on we ask for the `python3` plugin.

As a result, Ideascube gets started with Python 2, which obviously
fails.

We'd rather not keep fighting with the Debian packaging of uWSGI by
going to our own custom uwsgi.service file.

In addition, we can't use the uwsgi-emperor package from Debian because
it runs uWSGI as the www-data user, and thus can't switch to the
ideascube user for our application.

Therefore, this is the simplest solution: it respects the Debian
packaging of uWSGI, and only keeps configuration in our own files.

ideascube/ideascube,ideascube/ideascube,ideascube/ideascube,ideascube/ideascube