Use lazy-apps in uwsgi to fix sentry threading

Without this, uWSGI blocks sentry from transporting data because this is
done in a separate thread.  Without lazy-apps, uWSGI loads apps in the
master, which enforces a single-threading operation mode.

uwsgi.ini

@@ -5,6 +5,7 @@ wsgi-file = sipa.py
 callable = app
 harakiri = 2
 enable-threads = true
+lazy-apps = true
 
 mount = /sipa=sipa.py
 ; rewrite SCRIPT_NAME and PATH_INFO accordingly