ipvs: ignore IP_VS_CONN_F_NOOUTPUT in backup server

	As IP_VS_CONN_F_NOOUTPUT is derived from the
forwarding method we should get it from conn_flags just
like we do it for IP_VS_CONN_F_FWD_MASK bits when binding
to real server.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>