test: fix more it cases

[asddongmen]

Signed-off-by: dongmen [email protected]

What problem does this PR solve?

Issue Number: ref #442 close #849 close #853

What is changed and how it works?

Fix the following cases:

1. http_api
2. api_v2
3. availability

And fix a data race: #849
And fix a panic: #853

Check List

Tests

• Integration test
• Manual test (add detailed scripts or steps below)

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

None