AthenaOutputStream: added writeMetaData(), not calling metaFileTransition in ES mode

Marcin Nowakrequested to merge
mnowak/athena:sim.metadata into master

Added new method AthenaOutputStream::writeMetaData(filename) and moved code from the incident handler there. Changed the incident handler to not call transitionMetaDataFile() in EventService mode but use the new writeMetaData() directly. In this case the StopMetaDataIncident is not called at all.

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