NGINX version supported

OS-Version	nginx-version 	Download link
ubuntu-18.04	1.10.3		https://storage.googleapis.com/appsentinels-deployment/nginx/ubuntu-18.04-nginx-1.10.3.tar.gz
ubuntu-18.04	1.18.0		https://storage.googleapis.com/appsentinels-deployment/nginx/ubuntu-18.04-nginx-1.18.0.tar.gz
rhel-7          1.16.1          https://storage.googleapis.com/appsentinels-deployment/nginx/rhel-7-docker-nginx-1.16.1.tar.gz
dummy           dummy           dummy