add check flag for CONFIG_NETFILTER_XT_MATCH_IPVS CONFIG_IP_VS_NFCT CONFIG_IP_VS_RR in contrib/check-config.sh
add check flag for CONFIG_NETFILTER_XT_MATCH_IPVS CONFIG_IP_VS_NFCT CONFIG_IP_VS_RR in contrib/check-config.sh

Signed-off-by: alexchen <fd9322887e8d6708d5b2e96a6d9b534edb2f8651@gmail.com>
(cherry picked from commit 4c74469d30a71c53cc6b309a3c0048191b1ac008)
Signed-off-by: Victor Vieux <ce584ac70734cfa5a848cd28039798932c7ea675@docker.com>

stainboy/docker,medallia/docker,medallia/docker,stainboy/docker,medallia/docker,stainboy/docker,medallia/docker