Revert log level modification

Summary

During the refactoring of the drive handler class to implement the unit tests one log message changed from DEBUG to WARNING because the debug messaged said WARNING:. After the upgrade we are seeing a constant flow of WARNINGs in the monitoring due to this change. According to git history the commit message for the changes reads like 'Changed log level to DEBUG for not useful warnings'. We have been like this for the past 3 years. If it is not useful we should just remove it from the code, or at least move it back to DEBUG level