net/coap: Represent `ACK_RANDOM_FACTOR` multiplied by 1000
net/coap: Represent `ACK_RANDOM_FACTOR` multiplied by 1000

kYc0o/RIOT,miri64/RIOT,ant9000/RIOT,RIOT-OS/RIOT,smlng/RIOT,kaspar030/RIOT,jasonatran/RIOT,yogo1212/RIOT,jasonatran/RIOT,x3ro/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,yogo1212/RIOT,miri64/RIOT,toonst/RIOT,yogo1212/RIOT,yogo1212/RIOT,basilfx/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,ant9000/RIOT,authmillenon/RIOT,kYc0o/RIOT,OlegHahm/RIOT,authmillenon/RIOT,jasonatran/RIOT,toonst/RIOT,OlegHahm/RIOT,ant9000/RIOT,kaspar030/RIOT,smlng/RIOT,yogo1212/RIOT,smlng/RIOT,OTAkeys/RIOT,toonst/RIOT,kYc0o/RIOT,toonst/RIOT,basilfx/RIOT,basilfx/RIOT,RIOT-OS/RIOT,basilfx/RIOT,x3ro/RIOT,OlegHahm/RIOT,ant9000/RIOT,miri64/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,OlegHahm/RIOT,x3ro/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,authmillenon/RIOT,smlng/RIOT,jasonatran/RIOT,kYc0o/RIOT,smlng/RIOT,x3ro/RIOT,toonst/RIOT,miri64/RIOT,OlegHahm/RIOT,authmillenon/RIOT,miri64/RIOT,ant9000/RIOT,yogo1212/RIOT,authmillenon/RIOT,basilfx/RIOT,OTAkeys/RIOT,kaspar030/RIOT,x3ro/RIOT,authmillenon/RIOT