HUE-9103 [core] set settings.LOGGING_CONFIG to None
Django 1.7 [HUE-3287] made some changes to logging that we have not
adopted. On initialization, LOGGING_CONFIG sets some default loggers
that currently overwrite our current log.conf configuration. Set to None
for now, but consider upgrading our logging infra to LOGGING_CONFIG in
the future.
https://github.com/django/django/blob/ff00a053478fee06bdfb4206c6d4e079e98640ff/django/__init__.py#L19