Script to configure security on appliances

This script generates a key, copies it to the listed appliances, and restarts them, according to the steps in this doc:

https://access.redhat.com/articles/1124753

When only one appliance is specified, it generates the key and restarts. If multiple appliances are provided, it generates the key on one appliance (the first one specified), saves a copy locally, and then copies the key out to all other appliances before restarting all of them.