FIDO: Comment persistence

Example from fido.config

<comments_cleanse>
   <3600>
     .* =
   </3600>

   <86400>
     fido_campus_errors =
     upsAdvBatteryTemperature =
   </86400>
</comments_cleanse>

In above example, comments for fido_campus_errors and upsAdvBatteryTemperature are much greater than default [1 day]. The match is a regex on the item name.