Automate random identity on startup

[mdavis332]

With default cowrie settings, this is currently an issue: cowrie/cowrie#1102

In that thread, they mention this cool project which is a good starting place to customize cowrie identity: https://github.com/411Hall/obscurer

Some of that can be mapped into the PERSONALITY property in the sysconfig file. However, I think it would be useful to add the functions from that obscurer.py to run at cowrie container startup to automatically change things up to reduce fingerprinting.

Could try to make certain things user-customizable in the sysconfig file such as user list, etc. If not specified, it would go with a default list.