wsgi: Try to avoid extra django.setup calls.
wsgi: Try to avoid extra django.setup calls.

The zerver.models hack does not appear to be necessary now.
Meanwhile, get_wsgi_application has its own django.setup call, which
would overwrite the parts of our logging configuration pulled in by
zerver.models.

This fixes part of #15391; specifically, fixes it in production, but
not in development, where ‘manage.py runserver’ calls its own
django.setup and then imports various bits of our code before finding
zproject.wsgi.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulip.com>

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