Fix catz test error

The catz system test included a test case that was looking for a single
answer record after an update, when it should have been looking for two.
The test usually passed because of timing - the first dig usually got a
response before the update was completed - but occasionally the update
processed fast enough for the test to fail. On investigation, it turned
out to be the test that was wrong.

bin/tests/system/catz/tests.sh

@@ -216,7 +216,7 @@ echo_i "wait for secondary to be updated again ($n)"
 ret=0
 wait_for_txt() {
 	dig_with_opts @10.53.0.2 TXT foo.dom1.example. > dig.out.test$n || return 1
-	grep "ANSWER: 1," dig.out.test$n > /dev/null || return 1
+	grep "ANSWER: 2," dig.out.test$n > /dev/null || return 1
 	grep "status: NOERROR" dig.out.test$n > /dev/null || return 1
 	grep "IN.TXT." dig.out.test$n > /dev/null || return 1
 }