ipvs: no need to update skb route entry for local destination packets.

In the end of function __ip_vs_get_out_rt/__ip_vs_get_out_rt_v6,the
'local' variable is always zero.

Signed-off-by: zhang kai <zhangkaiheb@126.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>