fix: set socket buffer options before connect#3368
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What problem does this PR solve?
现有的tcp SNDBUF和RCVBUF设置时机有问题，不仅会导致设置失败，测试中发现还会导致buf固定位非预期的值。
参考:
https://man7.org/linux/man-pages/man7/tcp.7.html