Dev IP initialization

NxM was calling reset earlier than init, but inferno doesn't.  We'll
probably need to look at this again.

But now you can:

/ $ cat '#I/ipifc/clone'
0d/ $
/ $ ls '#I'
arp        icmpv6     iproute    ipselftab  ndb        udp
icmp       ipifc      iprouter   log        tcp
/ $ ls '#I/ipifc'
0      clone  stats