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[9.16] Remove expired rdataset headers from the heap

Ondřej Surý requested to merge 4591-improve-ttl-based-cleaning-9.16 into bind-9.16

It was discovered that an expired header could sit on top of the heap a little longer than desireable. Remove expired headers (headers with rdh_ttl set to 0) from the heap completely, so they don't block the next TTL-based cleaning.

Closes #4591 (closed)

Backport of !8754 (merged)

Edited by Ondřej Surý

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