YANGON - A former top general close to Myanmar's retired dictator Than Shwe has resigned as vice-president, Burmese media reported, ending the hardliner's role in the reformist government.Tin Aung Myint Oo, 61, submitted his resignation on May 3 for health reasons after returning from Singapore for medical treatment, the Myanmar language service of Voice of America reported on Sunday.The report could not be immediately confirmed.