Coolio's Son Grtis Ivey -- Sentenced for Hookerific Robbery

Coolio's Son Grtis Ivey -- Sentenced for Hookerific Robbery: Coolio's son Grtis Ivey -- who appeared on the family reality show "Coolio's Rules" -- has just been sentenced to prison for robbing an apartment in Vegas with a lady hooker friend ... and he could be locked up for 10 YEARS.A rep for the Clark…