Improve geoip updater to re-download less frequently on restarts.

On restarts, we ended up re-downloading the geoip data file each time if
it was older than a day. This improves things so we now touch the file
any time we download it (even if the file contents are the same), so we
know it's been checked recently.

bin/api-umbrella-geoip-auto-updater

@@ -69,6 +69,10 @@ while true; do
           echo "Reloading api-umbrella failed"
         fi
       fi
+
+      # Touch the file so we know we've checked it recently (even if we didn't
+      # replace it).
+      touch "$current_path"
     fi
   fi