More changes to the recent code to support control of forwarding
database via netlink.
* Support NTF_USE like neighbour table
* Validate state bits from application
* Only send notifications (and change bits) if new entry is
different.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>