ipsec: infra for selecting backends

Change-Id: Ifa6d8391b1b2413a88b7720fc434e0bc849a149a
Signed-off-by: Klement Sekera <ksekera@cisco.com>
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>
diff --git a/test/test_ipsec_tun_if_esp.py b/test/test_ipsec_tun_if_esp.py
index 292458d..e10e2a3 100644
--- a/test/test_ipsec_tun_if_esp.py
+++ b/test/test_ipsec_tun_if_esp.py
@@ -37,7 +37,8 @@
 
 class TestIpsecTunIfEsp1(TemplateIpsecTunIfEsp, IpsecTun4Tests):
     """ Ipsec ESP - TUN tests """
-    pass
+    tun4_encrypt_node_name = "esp4-encrypt"
+    tun4_decrypt_node_name = "esp4-decrypt"
 
 
 class TestIpsecTunIfEsp2(TemplateIpsecTunIfEsp, IpsecTcpTests):