user/group.go
func NewSystemGroup(name string, members ...string) *Group {
	return &Group{
		Name:     name,
		password: "",
		GID:      -1,
		UserList: members,

		addSystemGroup: true,
	}
}
func NewSystemGroup(name string, members ...string) *Group {
	return &Group{
		Name:     name,
		password: "",
		GID:      -1,
		UserList: members,

		addSystemGroup: true,
	}
}
// NewSystemGroup adds a system group.