libvirt-guests: status: return non-zero when stopped

Return 3 when the service is stopped, whether there
are saved guests or not, to conform with the LSB standards:

http://refspecs.linuxbase.org/LSB_3.1.1/LSB-Core-generic/LSB-Core-generic/iniscrptact.html

tools/libvirt-guests.sh.in

@@ -524,10 +524,11 @@ rh_status() {
     else
         if [ -f "$VAR_SUBSYS_LIBVIRT_GUESTS" ]; then
             gettext "started"; echo
+            RETVAL=0
         else
             gettext "stopped, with no saved guests"; echo
+            RETVAL=3
         fi
-        RETVAL=0
     fi
 }