demo.sh updates

[directionless]

Adds a post setup configuration step

To keep things somewhat cleaner, I also moved all the curl calls into a docker_curl function, and a get_login_token function. As well as moving the underlying setup and config data into json files.

After slack discussion, I updated the hostnames from kolide to fleet.

And enabled curl's TLS ca verification

[CLAassistant]

All committers have signed the CLA.