John Hartson is a big golf fanatic. The Celtic hero regularly partakes in charity golf days including for his own foundation fundraisers where he has played the links on countless occasions. Big Bad John can always also call on his old teammates and pals within the game to raise cash and put in a shift on the course. Perhaps that is why the Welshman still remembers one promise in particular from majority shareholder Dermot Desmond back in 2001. READ MORE: Dermot Desmond has his say on Brendan Rodgers, Celtic and Champions League in rare media appearanceThe owner was desperate to sign the strik…