ipsec: add ipv6 support for ipsec tunnel interface

Change-Id: I6a76907dc7bed2a81282b63669bea2219d6903c9
Signed-off-by: Kingwel Xie <kingwel.xie@ericsson.com>
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
diff --git a/test/template_ipsec.py b/test/template_ipsec.py
index 68f1183..483699c 100644
--- a/test/template_ipsec.py
+++ b/test/template_ipsec.py
@@ -477,14 +477,15 @@
             self.logger.info(self.vapi.ppcli("show error"))
             self.logger.info(self.vapi.ppcli("show ipsec"))
 
-        pkts = p.tun_sa_in.get_stats()['packets']
-        self.assertEqual(pkts, count,
-                         "incorrect SA in counts: expected %d != %d" %
-                         (count, pkts))
-        pkts = p.tun_sa_out.get_stats()['packets']
-        self.assertEqual(pkts, count,
-                         "incorrect SA out counts: expected %d != %d" %
-                         (count, pkts))
+        if (hasattr(p, "tun_sa_in")):
+            pkts = p.tun_sa_in.get_stats()['packets']
+            self.assertEqual(pkts, count,
+                             "incorrect SA in counts: expected %d != %d" %
+                             (count, pkts))
+            pkts = p.tun_sa_out.get_stats()['packets']
+            self.assertEqual(pkts, count,
+                             "incorrect SA out counts: expected %d != %d" %
+                             (count, pkts))
         self.assert_packet_counter_equal(self.tun6_encrypt_node_name, count)
         self.assert_packet_counter_equal(self.tun6_decrypt_node_name, count)