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Since 2008, the cleaning-interval timer has been documented as "effectively obsolete" and disabled in the default configuration with a comment saying "now meaningless". This change deletes all the code that implements the cleaning-interval timer, except for the config parser in whcih it is now explicitly marked as obsolete. I have verified (using the deletelru and deletettl cache stats) that named still cleans the cache after this change.
a9dca583