* Saudi Arabia long concerned by Iranian influence in Iraq * Iraq wants good ties with both neighbours - Jaafari * Saudis recently opened new embassy in Baghdad By Malak Ghobrial and Saif Eldin Hamdan CAIRO, March 11 (Reuters) - Iraq's foreign minister dismissed Saudi concerns that Iran was taking control of his country and he said Baghdad sought good relations with both regional powers. Sunni Muslim powerhouse Saudi Arabia, the main regional rival of Shi'ite Iran, fears Tehran's growing influence in Iraq, whose government is Shi'ite-led.