ipv6: Convert to use flowi6 where applicable.

drivers/infiniband/core/addr.c

drivers/net/cnic.c

include/linux/icmpv6.h

include/net/ip6_fib.h

include/net/ip6_route.h

include/net/ipv6.h

include/net/transp_v6.h

net/dccp/ipv6.c

net/ipv6/af_inet6.c

net/ipv6/datagram.c

net/ipv6/exthdrs.c

net/ipv6/fib6_rules.c

net/ipv6/icmp.c

net/ipv6/inet6_connection_sock.c

net/ipv6/ip6_fib.c

net/ipv6/ip6_flowlabel.c

net/ipv6/ip6_output.c

net/ipv6/ip6_tunnel.c

net/ipv6/ip6mr.c

net/ipv6/ipv6_sockglue.c