Add packet utils to packet.h

src/ip_reassembly/ip_reassembly.cpp

@@ -729,7 +729,7 @@ static struct packet *ip_frag_reassemble(struct ip_reassembly *assy, struct ip_f
 
     // create a new packet
     packet_parse(pkt, ptr, packet_len);
-    packet_set_action(pkt, PACKET_ACTION_DROP);
+    packet_set_drop(pkt);
 
     return pkt;