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[v9_18] Fix rndc dumpdb -expired for stuck cache contents

Matthijs Mekking requested to merge 3462-rndc-dumpdb-expired-doesnt-always-work-v9_18 into v9_18

The command 'rndc dumpdb -expired' will include expired RRsets in the output, but only for the RBTDB_VIRTUAL time (of 5 minutes). This means that if there is a cache cleaning problem and contents are not cleaned up, the rndc command has little diagnostic value. Fix this by including all RRsets in the dumpdb output if the '-expired' flag is set.

(cherry picked from commit 930ba2c9)

Closes #3462 (closed)

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