[Bugfix] Fix code regression caused by other recent commits + adjust the OPENAI_API_KEY templating

[srampal]

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[github-actions]

👥 vLLM Semantic Team Notification

The following members have been identified for the changed files in this PR and have been automatically assigned:

📁 deploy

Owners: @rootfs, @Xunzhuo
Files changed:

• deploy/kubernetes/istio/config.yaml
• deploy/kubernetes/istio/deployment.yaml
• deploy/kubernetes/llmd-base/llmd+public-llm/README.md
• deploy/kubernetes/llmd-base/llmd+public-llm/config.yaml.openai
• deploy/kubernetes/llmd-base/llmd+public-llm/httproute-openai.template

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This comment was automatically generated based on the OWNER files in the repository.