Add CONFIG_IP_VS_PROTO_TCP, CONFIG_IP_VS_PROTO_UDP, IP_NF_TARGET_REDIRECT to check-config.sh

On kernels without this options set, publishing ports for swarm
services does not work, making the published port not accessible
("connection refused")

Thanks to Wenbo Wang for reporting, and Tianon for finding this.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

contrib/check-config.sh

@@ -265,8 +265,11 @@ flags=(
 	CGROUP_HUGETLB
 	NET_CLS_CGROUP $netprio
 	CFS_BANDWIDTH FAIR_GROUP_SCHED RT_GROUP_SCHED
+	IP_NF_TARGET_REDIRECT
 	IP_VS
 	IP_VS_NFCT
+	IP_VS_PROTO_TCP
+	IP_VS_PROTO_UDP
  	IP_VS_RR
 )
 check_flags "${flags[@]}"