Use sk_mark for routing lookup in more places

Here is a followup on this area, thanks.

[RFC] af_packet: fill skb->mark at xmit

skb->mark may be used by classifiers, so fill it in case user
set a SO_MARK option on socket.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>