Improve the default logging configuration

Using the suggested logging configuration, messages were being lost
including serious exceptions, due to the 'django' logger not being
defined.

This brings local_settings.py in line with the upstream changes to
resolve this, and also adds a formatter to make the log message format
more consistent with other projects.

Change-Id: I13ea88602575196681e2ed6f0e5cea2cca8fddd6
Related-Bug: #1236423