EventService in AthenaMP fixes
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