No MOTD should be added if only disallowed services need to be restarted

[thiagomacieira]

Just logged in, I see:

 * Some system services need a restart.
   Run `sudo clr-service-restart -a -n` to view them.

But there are no non-disallowed services that need restarting:

$ sudo clr-service-restart -n -a
dbus.service: needs a restart (a library dependency was updated)
/usr/bin/systemctl --no-ask-password try-restart dbus.service
$ ls -l /etc/clr-service-restart/dbus.service
lrwxrwxrwx 1 root root 9 Oct 18 10:55 /etc/clr-service-restart/dbus.service -> /dev/null

The message should not say I should run clr-service-restart. It should either be silent or tell me I need to reboot.