MINOR:Topic command integration test migrate to new test infra

[TaiJuWu]

*More detailed description of your change,

1. New interface aliveBrokers() for clusterInstance.
2. Migrate opic command integration test migrate to new test infra

*Summary of testing strategy (including rationale)

Committer Checklist (excluded from commit message)

• [ ] Verify design and implementation
• [ ] Verify test coverage and CI build status
• [ ] Verify documentation (including upgrade notes)