Update settings.py
Update settings.py

set session expiry to 12h
superdesk/superdesk-ntb,ioanpocol/superdesk-ntb,petrjasek/superdesk-ntb,ioanpocol/superdesk-ntb,petrjasek/superdesk-ntb,ioanpocol/superdesk-ntb,petrjasek/superdesk-ntb,superdesk/superdesk-ntb,petrjasek/superdesk-ntb,superdesk/superdesk-ntb,superdesk/superdesk-ntb