vlib: add flag to explicitelly mark nodes which can init per-node packet trace

Type: feature

Change-Id: I913f08383ee1c24d610c3d2aac07cef402570e2c
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/vnet/devices/af_packet/node.c b/src/vnet/devices/af_packet/node.c
index 85f3e01..196c088 100644
--- a/src/vnet/devices/af_packet/node.c
+++ b/src/vnet/devices/af_packet/node.c
@@ -369,6 +369,7 @@
 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (af_packet_input_node) = {
   .name = "af-packet-input",
+  .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
   .sibling_of = "device-input",
   .format_trace = format_af_packet_input_trace,
   .type = VLIB_NODE_TYPE_INPUT,