增加动态端口

[1643661061leo]

v1/distributed/test_external_lb_dp.py、
增加了动态端口和CCL的一个环境变量以解决通信问题。
代码可以跑通，但是最终似乎存在网络代理问题，需要review

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Code Review

本次 PR 旨在通过增加动态端口分配和设置 CCL 环境变量来解决测试中的通信问题。代码审查发现了一些需要解决的关键问题：

1. CCL_WORKER_COUNT 环境变量被硬编码，应与 DP_SIZE 动态关联。
2. is_port_available 函数的实现不够可靠，并且存在竞态条件，可能导致测试不稳定。
3. 端口分配循环逻辑存在严重缺陷，可能导致多个服务器被分配到同一端口。

这些问题可能会导致测试失败或变得不稳定，建议在合并前进行修复。

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