[#164] Workers should restart periodically

They restart once a day, if the worker completes a job at least every hour.
The worker ID is compared to the hour of day and if the modulus matches, then
it exits (and is restarted by MCE). Should do the trick with memory usage.

Netdisco/lib/App/Netdisco/Daemon/Worker/Common.pm

@@ -38,6 +38,13 @@ sub worker_body {
       };
 
       $self->close_job($job);
+
+      # restart worker once a day.
+      # relies on the worker seeing a job at least every hour.
+      my $hour = [localtime()]->[2];
+      if ($wid and (($wid % 24) == $hour)) {
+          $self->exit(0, "recycling worker $wid");
+      }
   }
 }