Make in_arpinput(), inp_lookup_mcast_ifp(), icmp_reflect(),
ip_dooptions(), icmp6_redirect_input(), in6_lltable_rtcheck(), in6p_lookup_mcast_ifp() and in6_selecthlim() use new routing api.
Eliminate now-unused ip_rtaddr().
Fix lookup key fib6_lookup_nh_basic() which was lost diring merge.
Make fib6_lookup_nh_basic() and fib6_lookup_nh_extended() always
return IPv6 destination address with embedded scope. Currently rw_gateway has it scope embedded, do the same for non-gatewayed destinations.
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