Align system users with usermngr
Currently usermngr only has admin and user defined in uci, so system user defined in shadow and passwd make it a system user. This change is required to make it align with the usermngr uci.
Currently usermngr only has admin and user defined in uci, so system user defined in shadow and passwd make it a system user. This change is required to make it align with the usermngr uci.