(Adds U.S. reaction, background) BAGHDAD, Oct 18 (Reuters) - The Iraqi parliament on Saturday approved a Sunni Muslim to become defence minister and a Shi'ite to be interior minister, state television said, as part of a more inclusive government to help tackle Islamist insurgents. Six Kurdish members of the cabinet were also sworn in after the Kurdistan Regional Government (KRG) had held out for a larger share of ministries than the three offered when Prime Minister Haider al-Abadi unveiled his government on Sept.8. ...