Flow: Set flow iface and vlan_idx

Setting flow iface and vlan_idx from packet, making it possible to log
iface and vlan on psuedopackets and in flow-logs.

src/flow-util.c

@@ -153,6 +153,8 @@ void FlowInit(Flow *f, const Packet *p)
     f->recursion_level = p->recursion_level;
     f->vlan_id[0] = p->vlan_id[0];
     f->vlan_id[1] = p->vlan_id[1];
+    f->vlan_idx = p->vlan_idx;
+    f->livedev = p->livedev;
 
     if (PKT_IS_IPV4(p)) {
         FLOW_SET_IPV4_SRC_ADDR_FROM_PACKET(p, &f->src);