Test for tidb-cluster initialization job

[Yisaer]

Feature Request

Is your feature request related to a problem? Please describe:

• https://github.com/pingcap/tidb-operator/pull/917#issuecomment-532178830
• https://github.com/pingcap/tidb-operator/pull/922#pullrequestreview-289090800

Add e2e test or helm unit test case to ensure tidb-cluster initialization job set up properly in future without lots of manually test.

Describe the feature you'd like:

We could add e2e test or helm unit test to test all the initialization cases.

Describe alternatives you've considered:

e2e test and helm unit test.

Teachability, Documentation, Adoption, Migration Strategy:

• https://github.com/lrills/helm-unittest
• https://github.com/helm/chart-testing

[github-actions[bot]]

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