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>

extras/vom/vom/interface_cmds.cpp

@@ -723,6 +723,7 @@ set_tag::issue(connection& con)
   auto& payload = req.get_request().get_payload();
   payload.is_add = 1;
   payload.sw_if_index = m_hw_item.data().value();
+  memset(payload.tag, 0, sizeof(payload.tag));
   memcpy(payload.tag, m_name.c_str(), m_name.length());
 
   VAPI_CALL(req.execute());

src/vnet/interface.c

@@ -670,6 +670,7 @@ vnet_delete_sw_interface (vnet_main_t * vnm, u32 sw_if_index)
       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)