mde_installer.sh does not differentiate between supported Amazon Linux 2 & Unsupported Amazon Linux AMI 2018

[drscript0x0]

mde_installer.sh is currently not differentiating between the supported Amazon Linux 2 distro and the unsupported Amazon Linux AMI 2018 distro. Would like to see it return the error about unsupported distro whenever this gets runs against an old Amazon Linux AMI 2018 server.

Currently, it looks like the code only checks the $ID variable within the /etc/os-release file which would be "amzn" in either case. In the same file there is a $VERSION_ID variable that will have something like "2018.03" in the case of Amazon Linux AMI 2018 instead of "2" for Amazon Linux 2.