OSPFv3: add authentication test case

The sample capture was produced with RFC6506 implementation by Jyotsna
Priya of TCS (work in progress).
diff --git a/tests/TESTLIST b/tests/TESTLIST
index 88f97cc..745aed7 100644
--- a/tests/TESTLIST
+++ b/tests/TESTLIST
@@ -42,6 +42,7 @@
 
 # OSPF tests
 ospf-gmpls	ospf-gmpls.pcap		ospf-gmpls.out	-t -v
+ospf3_auth-vv	ospf3_auth.pcap		ospf3_auth-vv.out -t -v -v
 
 # IKEv2 tests
 ikev2four	ikev2four.pcap		ikev2four.out	-t -v
diff --git a/tests/ospf3_auth-vv.out b/tests/ospf3_auth-vv.out
new file mode 100644
index 0000000..69b7c26
--- /dev/null
+++ b/tests/ospf3_auth-vv.out
@@ -0,0 +1,10 @@
+IP6 (class 0xc0, hlim 1, next-header OSPF (89) payload length: 88) fe80::20c:29ff:fe9e:c1b2 > ff02::5: OSPFv3, Hello, length 88
+	Router-ID 10.10.10.2, Backbone Area
+	Options [V6, External, Router, Authentication Trailer]
+	  Hello Timer 10s, Dead Timer 40s, Interface-ID 0.0.0.2, Priority 1
+	  Designated Router 10.10.10.1, Backup Designated Router 10.10.10.2
+	  Neighbor List:
+	    10.10.10.1
+	Authentication Type HMAC, Length 48, SAID 1, CSN 0x00000000:52da4e0e
+	Authentication Data 0x0000:  ca4d 7d58 69a5 da3c 2a69 0eda a732 9bee
+	Authentication Data 0x0010:  9d7f 448c 9f31 fbe4 a0e9 b39c 6da6 cca1
diff --git a/tests/ospf3_auth.pcap b/tests/ospf3_auth.pcap
new file mode 100644
index 0000000..4b5bc81
--- /dev/null
+++ b/tests/ospf3_auth.pcap
Binary files differ