Example config for config-backend.json does not have control channel enabled
This config is supposed to showcase CB and CB commands, yet the control channel is disabled, so there's no way to send commands.
Couple things to consider:
- change the config to use control channel
- cb_cmds (and all other command providing hooks) should ensure the control channel is enabled and refuse to load if it isn't
- consider that perhaps Kea should open the control channel by default and have an ability to disable it somehow