Interface Tag: memset field in VOM, clear the tag in VPP on interface delete

Change-Id: Id97de732b5952d5d86202e7749c9e81cf8dbed87
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
diff --git a/src/vnet/interface.c b/src/vnet/interface.c
index d85d864..9300074 100644
--- a/src/vnet/interface.c
+++ b/src/vnet/interface.c
@@ -670,6 +670,7 @@
       if (config->xconnect || config->bridge)
 	set_int_l2_mode (vm, vnm, MODE_L3, sw_if_index, 0, 0, 0, 0);
     }
+  vnet_clear_sw_interface_tag (vnm, sw_if_index);
 
   /* Bring down interface in case it is up. */
   if (sw->flags != 0)