[9.18] "dnstap" system test fixes
Backport of !8177 (merged)
The change applied by commit 67df78e5 is already present in v9.18.
Closes #4240 (closed)
Backport of !8177 (merged)
The change applied by commit 67df78e5 is already present in v9.18.
Closes #4240 (closed)