Update Model Garden vllm serving docker script and dockerfile

[KCFindstr]

Update Model Garden vllm serving docker script and dockerfile.

3. If you are opening a PR for Community Content under the community-content folder:

• [x] Make sure your main Content Directory Name is descriptive, informative, and includes some of the key products and attributes of your content, so that it is differentiable from other content
• [x] The main content directory has been added to the CODEOWNERS file under the Community Content section, pointing to the author or the author's team.
• [x] Passes all the required formatting and linting checks. You can locally test with these instructions.

[gericdong]

@KCFindstr there is a conflict with the branch. Can you please resolve it? Thanks.

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