Disable configparser interpolation
Disable configparser interpolation

We do our own interpolation after we've loaded everything via
configparser, and having two levels of interpolation is confusing.

NOTE: Settings files that escape $ as $$ will need to be updated.
TODO: Our interpolation should be expanded to work with non-str values.

wylee/django-local-settings,PSU-OIT-ARC/django-local-settings