* zebra_rib.c, rib.h: Add distance and metric arguments to the

	* zebra_rib.c, rib.h: Add distance and metric arguments to the
	  rib_add_ipv6() function so that IPv6 routes in RIB can have correct
	  metric. No IPv6 routing daemon uses distance yet though.
	* zserv.c, connected.c, kernel_socket.c, rt_netlink.c,
	  rtread_proc.c,zserv.c: Pass metric and distance info to the
	  rib_add_ipv6().

	Forwardport from stable branch.