Netcat is now netcat-traditional

[GadgetGeekNI]

https://github.com/kasmtech/terraform/blob/f94935c9f1c8181cc9fd21bdb1ce0e6229c1ce7f/aws/standard/module/userdata/webapp_bootstrap.sh#L18

Change the above and other dependant lines to apt-get update && apt-get install -y netcat-traditional