------------------
* Propagate gunicorn.error log, and remove its default handler.
This allows consistant logging, making the choice in all cases that your
gunicorn logs go to the same stream as your other application log, making the
choice in all cases that your gunicorn logs go to the same stream as your other
application logs.
We issue a warning if the user tries to configure errorlog manually, as it
won't work as expected.