fix vllm template (#813)

# What does this PR do?

- Fix vLLM template to resolve
https://github.com/meta-llama/llama-stack/issues/805
- Fix agents test with shields

## Test Plan

```
vllm serve meta-llama/Llama-3.1-8B-Instruct
VLLM_URL="http://localhost:8000/v1" INFERENCE_MODEL="meta-llama/Llama-3.1-8B-Instruct" llama stack run ./llama_stack/templates/remote-vllm/run.yaml
```

```
LLAMA_STACK_BASE_URL=http://localhost:8321 pytest -v ./tests/client-sdk/
```

<img width="1245" alt="image"
src="https://github.com/user-attachments/assets/9af27684-5a9c-4187-b338-cbfc5211bd99"
/>


- custom tool flaky due to model outputs
- /completions API not implemented

**Vision Model**
- 11B-Vision-Instruct
<img width="1240" alt="image"
src="https://github.com/user-attachments/assets/1d3b3b17-fa09-43a7-b56c-3f77263825c5"
/>


## Sources

Please link relevant resources if necessary.


## Before submitting

- [ ] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [ ] Ran pre-commit to handle lint / formatting issues.
- [ ] Read the [contributor
guideline](https://github.com/meta-llama/llama-stack/blob/main/CONTRIBUTING.md),
      Pull Request section?
- [ ] Updated relevant documentation.
- [ ] Wrote necessary unit or integration tests.

docs/source/distributions/self_hosted_distro/remote-vllm.md

@@ -14,9 +14,12 @@ The `llamastack/distribution-remote-vllm` distribution consists of the following
 | API | Provider(s) |
 |-----|-------------|
 | agents | `inline::meta-reference` |
+| datasetio | `remote::huggingface`, `inline::localfs` |
+| eval | `inline::meta-reference` |
 | inference | `remote::vllm` |
 | memory | `inline::faiss`, `remote::chromadb`, `remote::pgvector` |
 | safety | `inline::llama-guard` |
+| scoring | `inline::basic`, `inline::llm-as-judge`, `inline::braintrust` |
 | telemetry | `inline::meta-reference` |
 | tool_runtime | `remote::brave-search`, `remote::tavily-search`, `inline::code-interpreter`, `inline::memory-runtime` |