This new command enables communicating with the unix administrative
endpoint (unix+admin) that can be enabled on soju.
The syntax is just that of BouncerServ.
Examples:
sojuctl -config soju.config help
sojuctl -config soju.config user status
Otherwise running `make` didn't do anything on a non-clean state. Go
deals with changed files automatically, and there's no real need to
explicitly specify them.
