Update status on SMPng locking for the network stack:

• I locked down if_disc.
• Sam and I locked down if_faith.
• I locked down if_gif at the interface layer.
• I reviewed IP tunnel ECN support, it's fine.
• Brooks is working on locking down the interface cloning code.
• I'm working on the IP-layer GIF support.
• We need to lock down the address lists.
• We need to review all compression API consumers (ppp, et al)
• We need to review the IP encapsulation library in ip_encap.c.
• We need to lock the if_ef "ethernet frame" driver.