IPSEC: for each engine and algorithm tests

refactor the IPSEC tests a bit so we can parameterise
the setup.

Change-Id: I777e5eb8f29ca1dce3dd273ebd05dae5846790af
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/ipsec/ipsec_sa.c b/src/vnet/ipsec/ipsec_sa.c
index af37b2e..da12560 100644
--- a/src/vnet/ipsec/ipsec_sa.c
+++ b/src/vnet/ipsec/ipsec_sa.c
@@ -268,7 +268,7 @@
   hash_unset (im->sa_index_by_sa_id, sa->id);
   err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
   if (err)
-    return VNET_API_ERROR_SYSCALL_ERROR_1;
+    return VNET_API_ERROR_SYSCALL_ERROR_2;
 
   if (ipsec_sa_is_set_IS_TUNNEL (sa) && !ipsec_sa_is_set_IS_INBOUND (sa))
     {