upstream server list order not equal lead to nginx hash fail

[lindzh]

server 10.111.35.46:8080 weight=1 max_fails=2 fail_timeout=10s;
server 10.111.35.47:8080 weight=1 max_fails=2 fail_timeout=10s;

在不同的nginx 上，生成的 upstream 文件不一样，导致 hash 负载均衡失效。