[Feature Request] Start ipengine without a connection file

[elibixby]

The config file ipcontroller-client.json appears to be required to start ipengine, Once more the values in the config file appear to override the values provided via command line flags like --ip and --location, so there doesn't seem to be any situation where the command-line flags actually matter.

I'd like to be able to start ipengine without a config file, and pass all the values I need as command line flags.