Use correct msg ID in the sw-interface-event from TAP and VHOST

Change-Id: I0124fa264f7f390fc7cd9722da59be03116831c5
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/unix/tap_api.c b/src/vnet/unix/tap_api.c
index 7e812c4..3a64e10 100644
--- a/src/vnet/unix/tap_api.c
+++ b/src/vnet/unix/tap_api.c
@@ -67,7 +67,7 @@
 
   mp = vl_msg_api_alloc (sizeof (*mp));
   memset (mp, 0, sizeof (*mp));
-  mp->_vl_msg_id = ntohs (VL_API_SW_INTERFACE_SET_FLAGS);
+  mp->_vl_msg_id = ntohs (VL_API_SW_INTERFACE_EVENT);
   mp->sw_if_index = ntohl (sw_if_index);
 
   mp->admin_up_down = 0;