[IMP] add cache backend settings to sample config
[IMP] add cache backend settings to sample config

DirkHoffmann/indico,indico/indico,indico/indico,mic4ael/indico,OmeGak/indico,DirkHoffmann/indico,mic4ael/indico,mic4ael/indico,OmeGak/indico,ThiefMaster/indico,DirkHoffmann/indico,pferreir/indico,ThiefMaster/indico,mic4ael/indico,OmeGak/indico,indico/indico,ThiefMaster/indico,indico/indico,mvidalgarcia/indico,mvidalgarcia/indico,mvidalgarcia/indico,pferreir/indico,pferreir/indico,pferreir/indico,ThiefMaster/indico,DirkHoffmann/indico,mvidalgarcia/indico,OmeGak/indico