ipv6: ndisc: inherit metadata dst when creating ndisc requests

If output device wants to see the dst, inherit the dst of the original skb
in the ndisc request.

This is an IPv6 counterpart of commit 0accfc268f4d ("arp: Inherit metadata
dst when creating ARP requests").

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/net/ndisc.h
Simple merge

diff --cc net/ipv6/addrconf.c
Simple merge

diff --cc net/ipv6/ndisc.c
Simple merge

diff --cc net/ipv6/route.c
Simple merge