add a DNSSEC test case

This is related to GH #445 and GH #467.

tests/TESTLIST

@@ -185,6 +185,8 @@ m3ua-vv isup.pcap isupvv.out -t -vv
 
 # syslog test case
 syslog-v	syslog_udp.pcap		syslog-v.out		-t -v
+# DNSSEC from https://bugzilla.redhat.com/show_bug.cgi?id=205842, -vv exposes EDNS DO
+dnssec-vv	dnssec.pcap		dnssec-vv.out		-t -vv
 
 #IPv6 tests
 ipv6-bad-version.pcap	ipv6-bad-version.pcap 	ipv6-bad-version.out	-t

tests/dnssec-vv.out

@@ -0,0 +1,12 @@
+IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 74)
+    127.0.0.1.43144 > 127.0.0.1.53: [bad udp cksum 0xfe49 -> 0xb5ef!] 20972+ [1au] SSHFP? monadic.cynic.net. ar: . OPT UDPsize=4096 OK (46)
+IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 3040)
+    127.0.0.1.53 > 127.0.0.1.43144: [bad udp cksum 0x09e0 -> 0x4239!] 20972$ q: SSHFP? monadic.cynic.net. 3/6/13 monadic.cynic.net. SSHFP, monadic.cynic.net. RRSIG, monadic.cynic.net. RRSIG ns: cynic.net. NS ns1.cynic.net., cynic.net. NS ns4.cynic.net., cynic.net. NS ns2.cynic.net., cynic.net. NS ns3.cynic.net., cynic.net. RRSIG, cynic.net. RRSIG ar: ns1.cynic.net. A 125.100.126.205, ns2.cynic.net. A 199.175.137.213, ns3.cynic.net. A 203.141.153.22, ns4.cynic.net. A 122.103.238.186, ns1.cynic.net. RRSIG, ns1.cynic.net. RRSIG, ns2.cynic.net. RRSIG, ns2.cynic.net. RRSIG, ns3.cynic.net. RRSIG, ns3.cynic.net. RRSIG, ns4.cynic.net. RRSIG, ns4.cynic.net. RRSIG, . OPT UDPsize=4096 OK (3012)
+IP (tos 0x0, ttl 64, id 22838, offset 0, flags [DF], proto UDP (17), length 74)
+    127.0.0.1.32972 > 127.0.0.1.53: [bad udp cksum 0xfe49 -> 0x28d8!] 48576+ [1au] A? monadic.cynic.net. ar: . OPT UDPsize=1024 (46)
+IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 226)
+    127.0.0.1.53 > 127.0.0.1.32972: [bad udp cksum 0xfee1 -> 0x60dd!] 48576 q: A? monadic.cynic.net. 1/4/5 monadic.cynic.net. A 125.100.126.202 ns: cynic.net. NS ns4.cynic.net., cynic.net. NS ns2.cynic.net., cynic.net. NS ns3.cynic.net., cynic.net. NS ns1.cynic.net. ar: ns1.cynic.net. A 125.100.126.205, ns2.cynic.net. A 199.175.137.213, ns3.cynic.net. A 203.141.153.22, ns4.cynic.net. A 122.103.238.186, . OPT UDPsize=4096 (198)
+IP (tos 0x0, ttl 64, id 22904, offset 0, flags [DF], proto UDP (17), length 74)
+    127.0.0.1.36069 > 127.0.0.1.53: [bad udp cksum 0xfe49 -> 0xf266!] 49432+ [1au] SSHFP? monadic.cynic.net. ar: . OPT UDPsize=0 (46)
+IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 244)
+    127.0.0.1.53 > 127.0.0.1.36069: [bad udp cksum 0xfef3 -> 0x1227!] 49432 q: SSHFP? monadic.cynic.net. 1/4/5 monadic.cynic.net. SSHFP ns: cynic.net. NS ns4.cynic.net., cynic.net. NS ns1.cynic.net., cynic.net. NS ns3.cynic.net., cynic.net. NS ns2.cynic.net. ar: ns1.cynic.net. A 125.100.126.205, ns2.cynic.net. A 199.175.137.213, ns3.cynic.net. A 203.141.153.22, ns4.cynic.net. A 122.103.238.186, . OPT UDPsize=4096 (216)