Minor cleanup of IOVDbSvc

Vakhtang Tsulaiarequested to merge
tsulaia/athena:master-IOVDbSvc-cleanup into master

IOVDbSvc::registerTagInfoCallback() function never actually registered a callback. Instead it just forwarded the call to IOVDbSvc::processTagInfo().

In this commit IIOVDbSvc::registerTagInfoCallback() was dropped, and replaced with IIOVDbSvc::processTagInfo().

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