Redirection from https:// to http://

Created by: SunilMohanAdapa

When running under https URL and when running under Apache, Plinth seems to redirect from https URLs to http URL. This should be fixed for security and to avoid warnings from browsers.

I believe this is happening because Django sees http URLs comming from Apache due to proxying confguration. I leads Django to think that it has to redirect to http URLs instead of https.