EventService in AthenaMP fixes

Marcin Jerzy Nowak requested to merge mnowak/athena:EvService.MP.fixes into master

Fix: IOVDbSvc was holding on PoolSvc contextID over fork and I/O reinit, after which it was invalid and interfering with other contexts. Made IOVDbSvc a client of IIoComponentMgr to reset the context

PoolSvc was not cleaning up its map of contexts fully at I/O reninit

  • fixed

MetaDataSvc transitionMetaDataFile was refusing to run for ES

  • cleared the blocking unnecessary flag

Implemented handling of "end of range" NextEventRange incidents for MP mode

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