### What this PR does / why we need it?
While in the scenario where the pod has been started, but the
corresponding DNS service is not yet ready. If we immediately resolve
the DNS domain name at this time, an error will occur. see
https://github.com/vllm-project/vllm-ascend/actions/runs/19436639688/job/55609108796
- vLLM version: v0.11.0
- vLLM main:
2918c1b49c
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Signed-off-by: wangli <wangli858794774@gmail.com>