Add logs for storage pools reordering

[julien-vaz]

Description

Since the storage pool reordering process was lacking logs for troubleshooting, some debug level log messages were added and trace level log messages were changed to the debug level. Also, the log messages were rewritten according to the new Log4j2 syntax.

Types of changes

• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] Enhancement (improves an existing feature and functionality)
• [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
• [ ] build/CI
• [ ] test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• [ ] Major
• [x] Minor

How Has This Been Tested?

1. A volume was created;
2. Its disk offering was changed;
3. It was verified that the log messages were properly being displayed.