session: add handle to disconnect_session_reply api msg.

Change-Id: I40f80110f5224b676d60252f9721fd1bc8a10b58
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>
diff --git a/src/vnet/session/session_api.c b/src/vnet/session/session_api.c
index 7de77dd..cd7541d 100755
--- a/src/vnet/session/session_api.c
+++ b/src/vnet/session/session_api.c
@@ -520,7 +520,7 @@
     }
 
 done:
-  REPLY_MACRO (VL_API_DISCONNECT_SESSION_REPLY);
+  REPLY_MACRO2 (VL_API_DISCONNECT_SESSION_REPLY, rmp->handle = mp->handle);
 }
 
 static void