[Bug]: <解决nc命令的2883端口探测导致异常登录日志>

[xiaoleizi2016]

Describe the bug

obproxy的nc健康检查，因为不是完备的mysql协议，导致obproxy不停地打Connect error链接错误。
2023-07-04 10:37:33.341153,app,,,,::,OB_MYSQL,,,COM_LOGIN,,failed,-4124,,801us,0us,0us,0us,Y0-7D44730143A0,,,,0,,Connect error
2023-07-04 10:38:33.261336,app,,,,::,OB_MYSQL,,,COM_LOGIN,,failed,-4124,,145us,0us,0us,0us,Y0-7D44730143A0,,,,0,,Connect error
2023-07-04 10:41:48.266505,app,,,,::,OB_MYSQL,,,COM_LOGIN,,failed,-4124,,87us,0us,0us,0us,Y0-7D44722143A0,,,,0,,Connect error
2023-07-04 10:43:33.211679,app,,,,::,OB_MYSQL,,,COM_LOGIN,,failed,-4124,,406us,0us,0us,0us,Y0-7D44730143A0,,,,0,,Connect error
2023-07-04 10:44:33.376363,app,,,,::,OB_MYSQL,,,COM_LOGIN,,failed,-4124,,2813us,0us,0us,0us,Y0-7D44722143A0,,,,0,,Connect error

Environment

• OS Version and CPU Arch(uname -a):
  所有环境
• Component Version:

Fast Reproduce Steps(Required)

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Expected behavior

Actual Behavior

Additional context