add ATLAS_CHECK_THREAD_SAFETY to CaloClusterCorrection

Add ATLAS_CHECK_THREAD_SAFETY to CaloClusterCorrection

• static --> static const
• Remove const in one place when is not needed
• More interesting a couple of tools have initialize that potentially can register callbacks. Given the convention for MT initialize at large does not need to be thread safe. So Marked the specific methods as NOT_THREAD_SAFE. But as this is only potential (depends on job options) I did not mark the full class.