Load kea config from another kea server

I would appear we have all the necessary mechanisms to enable a secondary HA server to load its configuration from the primary. This feature could be enabled with a command line parameter that could instruct the server to look and retrieve its config from a server/address before loading its local config. In this way users running into issues caused by mismatching configurations and typos. The interface name and "this-server-name" would need to be syntherzied somehow.