add a system test for AXFR fallback when max-ixfr-ratio is exceeded

also cleaned up the ixfr system test:

- use retry_quiet when applicable
- use scripts to generate test zones
- improve consistency

bin/tests/system/ixfr/setup.sh

@@ -12,35 +12,56 @@
 SYSTEMTESTTOP=..
 . $SYSTEMTESTTOP/conf.sh
 
-cat <<EOF >ns1/named.conf
-options {
-	query-source address 10.53.0.1;
-	notify-source 10.53.0.1;
-	transfer-source 10.53.0.1;
-	port ${PORT};
-	pid-file "named.pid";
-	listen-on { 10.53.0.1; };
-	listen-on-v6 { none; };
-	recursion no;
-	notify yes;
-};
-
-key rndc_key {
-	secret "1234abcd8765";
-	algorithm hmac-sha256;
-};
-
-controls {
-	inet 10.53.0.1 port ${CONTROLPORT} allow { any; } keys { rndc_key; };
-};
-EOF
+$SHELL clean.sh
 
+copy_setports ns1/named.conf.in ns1/named.conf
 copy_setports ns3/named.conf.in ns3/named.conf
 copy_setports ns4/named.conf.in ns4/named.conf
 copy_setports ns5/named.conf.in ns5/named.conf
 
-# Setup initial db files for ns3
-cp ns3/mytest0.db ns3/mytest.db
-cp ns3/subtest0.db ns3/subtest.db
+# Set up db files for zone "test" - this is a series of four
+# versions of the zone, the second and third having small changes
+# and the fourth having a large one.
+
+testdb () {
+    cat << EOF
+\$ORIGIN $1
+\$TTL    15
+@  15  IN        SOA ns1.test. hostmaster.test. (
+                              $2 ; serial
+                              3H ; refresh
+                              15 ; retry
+                              1w ; expire
+                              3h ; minimum
+                             )
+       IN  NS     ns1.test.
+       IN  NS     ns2.test.
+       IN  NS     ns5.test.
+ns1    IN  A      10.53.0.3
+ns2    IN  A      10.53.0.4
+ns5    IN  A      10.53.0.5
+EOF
+
+    i=0
+    while [ $i -lt $3 ]; do
+        echo "host$i IN A 192.0.2.$i"
+        i=$((i+1))
+    done
+}
+
+testdb test. 1 60 > ns3/mytest.db
+testdb test. 2 61 > ns3/mytest1.db
+testdb test. 3 62 > ns3/mytest2.db
+testdb test. 4 0  > ns3/mytest3.db
+
+# Set up similar db files for sub.test, which will have IXFR disabled
+testdb sub.test. 1 60 > ns3/subtest.db
+testdb sub.test. 3 61 > ns3/subtest1.db
+
+# Set up a large zone
+i=0
 $SHELL ../genzone.sh 3 > ns3/large.db
-awk 'END { for (i = 0; i < 10000; i++) printf("record%d 10 IN TXT this is record %d\n", i, i) }' < /dev/null >> ns3/large.db
+while [ $i -lt 10000 ]; do
+    echo "record$i 10 IN TXT this is record %i" >> ns3/large.db
+    i=$((i+1))
+done