Revert "ipv6: ndisc: inherit metadata dst when creating ndisc requests"

Revert "ipv6: ndisc: inherit metadata dst when creating ndisc requests"

This reverts commit 8c64335327a3817c432d4887d3a3c66889d1d072.

In IPv6, we cannot inherit the dst of the original dst. ndisc packets
are IPv6 packets and may take another route than the original packet.

This patch breaks the following scenario: a packet comes from eth0 and
is forwarded through vxlan1. The encapsulated packet triggers an NS
which cannot be sent because of the wrong route.

CC: Jiri Benc <jbenc@redhat.com>
CC: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>