Description

Adding unit tests to main to bring coverage for main.go to 93%+.
Refactored main to accommodate dependency injection for testing.

GitHub Issues

List the GitHub issues impacted by this PR:

Checklist:

• Have you run format,vet & lint checks against your submission?
• Have you made sure that the code compiles?
• Did you run the unit & integration tests successfully?
• Have you maintained at least 90% code coverage?
• Have you commented your code, particularly in hard-to-understand areas
• Have you done corresponding changes to the documentation
• Did you run tests in a real Kubernetes cluster?
• Backward compatibility is not broken

How Has This Been Tested?

Built a new image for the driver, deployed and tested via cert-csi certify with both a single controller and multiple controller replicas.