lvs: No route to host

ip lvs have multi node. the vip may be connect failed.

test:
1. while true;do ;nc -vz 192.168.0.252 5432 sleep 1; done
2. for (( i=0; i < 100; i++))
do
	nc -vz 192.168.0.252 5432
done

platforms/kubernetes/postgres-operator/postgres/pgsqlcommons/constants.py

@@ -282,7 +282,7 @@
 
     {real_main_servers}
 }}
-virtual_server {read_vip} {port} {{
+virtual_server fwmark 1 {{
     delay_loop 10
     lb_algo lc
     lb_kind DR