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Ensure the correct ordering zone_shutdown() vs zone_gotwritehandle()

Ondřej Surý requested to merge 3071-signed-version-of-an-inline-signed-zone-may-be-dumped-without-unsigned-serial-number-v9_16 into v9_16

When the signed version of an inline-signed zone is dumped to disk, the serial number of the unsigned version of the zone is written in the raw-format header so that the contents of the signed zone can be resynchronized after named restart if the unsigned zone file is modified while named is not running (see RT #26676).

In order for the serial number of the unsigned zone to be determined during the dump, zone->raw must be set to a non-NULL value. This should always be the case as long as the signed version of the zone is used for anything by named.

However, under certain circumstances the zone->raw could be set to NULL while the zone is being dumped.

Defer detaching from zone->raw in zone_shutdown() if the zone is in the process of being dumped to disk.

(cherry picked from commit cc1d4e1a)

Closes #3071 (closed)

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