Hopefully finished kernel syncer (krt) rewrite:

Hopefully finished kernel syncer (krt) rewrite:

  o  Interface syncing is now a part of krt and it can have configurable
     parameters. Actually, the only one is scan rate now :)
  o  Kernel routing table syncing is now synchronized with interface
     syncing (we need the most recent version of the interface list
     to prevent lots of routes to non-existent destinations from
     appearing). Instead of its own timer, we just check if it's
     route scan time after each iface list scan.
  o  Syncing of device routes implemented.
  o  CONFIG_AUTO_ROUTES should control syncing of automatic device routes.
  o  Rewrote krt_remove_route() to really remove routes :)
  o  Better diagnostics.
  o  Fixed a couple of bugs.