set timeout options to prevent "connnect", "real_query" to be blocked for tens of minutes #152
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Set the MYSQL_OPT_CONNECT_TIMEOUT, MYSQL_OPT_READ_TIMEOUT, MYSQL_OPT_WRITE_TIMEOUT options to prevent switching VIP/restarting the gateway after unplugging the network cable, causing "connnect", "real_query", etc. to be blocked for tens of minutes