pw groupdel error on boot
one of the pw groupdel commands passes a GID without -g, resulting in bootup log like:
rc.bootup: The command '/usr/sbin/pw groupdel 2001' returned exit code '65', the output was 'pw: unknown group `2001''
Silence mwexec output. Now that the groupdel actually works, it spams the log when group isn't found. Ticket #6352