Load groups from command line

In the web interface we can reload groups if we make changes to our groups.yaml file. I had an error in mine and it’s stuck just spinning. I ran the check config script, found and fixed my error. But I can’t get it to reload the groups now since the button is a spinner. It would be nice if we could do the reload groups from the command line so when the gui gets stuck, we can get the groups reloaded and hopefully un-stick it.