vcl: add config option for preferred tls engine

Type: feature

Change-Id: If6c095c9b737cb524a9232dcfa9be0f93f04d114
Signed-off-by: Florin Coras <fcoras@cisco.com>
diff --git a/src/vcl/vcl_private.h b/src/vcl/vcl_private.h
index 7746862..8fdf755 100644
--- a/src/vcl/vcl_private.h
+++ b/src/vcl/vcl_private.h
@@ -211,6 +211,7 @@
   char *event_log_path;
   u8 *vpp_api_filename;
   u8 *vpp_api_socket_name;
+  u32 tls_engine;
 } vppcom_cfg_t;
 
 void vppcom_cfg (vppcom_cfg_t * vcl_cfg);