Fix for secrets getting regenerated on apply of driver manifest

[rensyct]

Description

This PR has fix for secrets getting regenerated on kubectl apply of any driver manifest.

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #
dell/csm#743

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, vetting, linting, or security issues
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have maintained backward compatibility

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

1. Installed the operator followed by install of Unity driver.
2. Make change to any of the field in driver manifest and apply the changes
3. Check the secrets. It should not get generated.
   Repeat step 2 couple of times and ensure that secrets are not getting regenerated.