i8sak: i8sak daemon now gets shutdown if not in use.
Previously, once the i8sak daemon was started, by running any command, it would stay running. This means that if you want to use i8sak to setup your network, but then want exclusive access to the char device, or network device, you have to manually shutdown the i8sak daemon. Now the daemon stays active as long as required to finish any commands, or stays open if a new command keeps it on, but when all work is finished, it shuts down.
Approved-by: GregoryN <gnutt@nuttx.org>
162fb66ecf