Feanil/nat monitor

If you want to simply copy what I did for the s3 sync script see the `onerror()` function that is used to send mail via sns on any error https://github.com/edx/configuration/blob/master/playbooks/roles/aws/templates/send-logs-to-s3.j2#L63  you can also add a `trap onerror ERR SIGHUP SIGINT SIGTERM` on any signal or any time a child process of your script has a non-zero exit code.