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在 cookie 给错时，快速失败。
在此修复前，即使 cookie 配置错误，emqx 命令仍然会尝试去 ping EMQX 节点，
并得到一个 "Node xxx not responding to pings" 的错误。
修复后，如果发现 cookie 不一致，立即打印不一致的错误信息并退出。