KOYA, Iraq (AP) — Public tensions have surfaced between the exiled son of Iran’s last shah and a coalition of Kurdish Iran dissident groups in recent days. The frictions have highlighted cracks in the Iranian opposition in the wake of mass anti-government protests and a brutal crackdown and as the country faces a potential war if negotiations with the U.S. to reach a nuclear deal fail. On Sunday, five Kurdish groups announced the formation of the Coalition of Political Forces of Iranian