Parallel routing code patch #2

[Matthew Dillon]

    Here's the second patch:

    fetch http://apollo.backplane.com/DFlyMisc/routing02.patch

    This fixes a refcnt issue.  There is still an issue with some 
    routes not being replicated properly which is causing certain
    route deletions to result in a sanity check assertion panic.

    The recently committed netstat, route, and arp commands can be
    used to help locate discrepancies between cpus using e.g.

	netstat -rn -c 0
	netstat -rn -c 1

    At the moment I am seeing discrepancies with IPV6, ARP, and
    cloned routes.

					-Matt