fix sql-managed-instance.yml

[pipatji]

Purpose

Fix playbook error on creating subnet part

Does this introduce a breaking change?

• [ ] Yes
• [x] No

Pull Request Type

What kind of change does this Pull Request introduce?

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Documentation content changes
• [ ] Other... Please describe:

How to Test

• Install ansible ansible-playbook sql-managed-instance.yml

What to Check

Verify that the playbook is successfully run.

Other Information

[Fred-sun]

ready_for_review

[Fred-sun]

@mybayern1974 This PR only fixes a small omission in the test script, please help to merge, Thank you very much!

[Fred-sun]

@haiyuazhang Would you please help take a review this PR and push for merge( change small)? Thank you very much!

[Fred-sun]

@gavinfish @haiyuazhang review_need!