improve: modify the error message to compatible with go-redis #1244
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go-redis 库在邵兵模式下会检查 hello 命令是否支持,通过“ERR unknown command”判读不支持 hello 命令。
但是 pika 中 不支持的命令报错是“ERR unknown or unsupported command”,故而导致 go-redis 判断错误。