add new AMIs: ubuntu-1804-docker-1903, ubuntu-1604-docker-1903
add new AMIs: ubuntu-1804-docker-1903, ubuntu-1604-docker-1903

cjellick/rancher,rancherio/rancher,cjellick/rancher,cjellick/rancher,rancher/rancher,rancher/rancher,rancher/rancher,rancherio/rancher,rancher/rancher