Add workaround for Kind apiserver delegation issue

See #324

hack/kind-linux.sh

@@ -29,4 +29,6 @@ for node in "$@"; do
     peerName=$(docker run --net=host antrea/ethtool:latest ip link | grep ^"$peerIdx": | awk -F[:@] '{ print $2 }' | cut -c 2-)
     echo "Disabling TX checksum offload for node $node ($peerName)"
     docker run --net=host --privileged antrea/ethtool:latest ethtool -K "$peerName" tx off
+    # Workaround for https://github.com/vmware-tanzu/antrea/issues/324
+    docker exec "$node" sysctl -w net.ipv4.tcp_retries2=4
 done