[RIP-10] Add test cases for CommitLog.handleHA

[a51764579]

What is the purpose of the change

Add test cases for CommitLog.handleHA.

Brief changelog

test for CommitLog.handleHA.

Verifying this change

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• Make sure there is a Github issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a Github issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
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• Write necessary unit-test(over 80% coverage) to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in test module.
• Run mvn -B clean apache-rat:check findbugs:findbugs checkstyle:checkstyle to make sure basic checks pass. Run mvn clean install -DskipITs to make sure unit-test pass. Run mvn clean test-compile failsafe:integration-test to make sure integration-test pass.
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[hdchen]

LGTM

[coveralls]

Coverage increased (+1.2%) to 46.043% when pulling 9fa2d5b on a51764579:master into 6a573a7 on apache:develop.

[ShannonDing]

Could you please remove the unnecessary commit logs？

[a51764579]

Could you please remove the unnecessary commit logs？