[bgpd] V. quick route flap gets mistaken for duplicate, route is then ignored

[bgpd] V. quick route flap gets mistaken for duplicate, route is then ignored

2007-04-08 Paul Jakma <paul.jakma@sun.com>

	* bgp_route.c: (general) Same bug as fixed on 2006-11-28 by ajs for
	  bgp static routes, but for main BGP RIB: Quick 'flap' of routes
	  can cause bgpd to mistake a new route for a duplicate route,
	  due to presence of removed, but not yet processed BGP RIB entry.
	  (bgp_update_rsclient) Ignore REMOVED bgp_info for duplicate,
	  restore route instead.
	  (bgp_update_main) Ditto.