host tools: allow the 'greatfet' tool to go by 'gf' as well
host tools: allow the 'greatfet' tool to go by 'gf' as well

This is how I have my local setup working; and it feels _great_.

dominicgs/GreatFET-experimental,greatscottgadgets/greatfet,greatscottgadgets/greatfet,dominicgs/GreatFET-experimental,greatscottgadgets/greatfet,dominicgs/GreatFET-experimental,greatscottgadgets/greatfet