ipsec: handle UDP keepalives

Type: feature

Change-Id: I87cc1168466f267e8c4bbec318401982f4bdf03a
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/test/vpp_ipsec_tun_interface.py b/test/vpp_ipsec_tun_interface.py
index 97359b1..c561a1f 100644
--- a/test/vpp_ipsec_tun_interface.py
+++ b/test/vpp_ipsec_tun_interface.py
@@ -27,7 +27,7 @@
         else:
             self.local_ip = self.parent_if.local_ip4
             self.remote_ip = self.parent_if.remote_ip4
-        self.udp_encap = False
+        self.udp_encap = udp_encap
 
     def add_vpp_config(self):
         r = self.test.vapi.ipsec_tunnel_if_add_del(