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[v9_16] Fix catalog zone reconfiguration crash

Merged Arаm Sаrgsyаn requested to merge 1608-catz-reconfig-crash-fix-v9_16 into v9_16

The following scenario triggers a "named" crash:

  1. Configure a catalog zone.
  2. Start "named".
  3. Comment out the "catalog-zone" clause.
  4. Run rndc reconfig.
  5. Uncomment the "catalog-zone" clause.
  6. Run rndc reconfig again.

Implement the required cleanup of the in-memory catalog zone during the first rndc reconfig, so that the second rndc reconfig could find it in an expected state.

(cherry picked from commit 43ac2cd2)

Closes #1608 (closed)