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Add locking to file metadata tools

Marcin Nowak requested to merge mnowak/athena:meta.locking into master

Introduce file metadata locking interface on the level of metadata tools (we have tools specialized for particular types of metadata) so that no updates are possible during file reading/writing.
This MR implements this interface for IOVMetaDataTool.
IOVDbFolder no longer keeps a pointer to IOVDbMetaDataContainer but gets the data through the IOVMetaDataTool (using the new locking)

Edited by Marcin Nowak

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