[IMP] Added NullCache, for cacheless setups
[IMP] Added NullCache, for cacheless setups

 * Useful mostly for debugging or in case of service failure;

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