arp: Embed netmsg_inarp in mbuf for asynchronized ARP input processing
- Embed netmsg_inarp, which records necessary states for routing table
updating and later ARP reply, into mbuf; this does not change mbuf
header size.
- If routing tables need updating upon ARP packet reception, the
netmsg_inarp embedded in the input ARP packet is sent asynchronizingly
to routing threads and the possible ARP reply is defered until all
routing tables are updated, i.e. the ARP packet is redispatched to
netisr0 for the ARP reply sending from the last routing thread.
- Remove no longer needed dedicated network threads.
Discussed-with: dillon@