Use Read and WriteHandle for AttributeList in EventSelector.

...t/AthenaPoolTest/share/DoubleEventSelectorOverlayTest.ref

...AthenaPoolTest/share/DoubleEventSelectorOverlayTestMT.ref

...enaPoolExampleAlgorithms/share/AthenaPoolExample_Copy.ref

...naPoolExampleAlgorithms/share/AthenaPoolExample_RCond.ref

...PoolExampleAlgorithms/share/AthenaPoolExample_ReWrite.ref

...xampleAlgorithms/share/AthenaPoolExample_ReWriteAgain.ref

...ExampleAlgorithms/share/AthenaPoolExample_ReWriteNext.ref

...naPoolExampleAlgorithms/share/AthenaPoolExample_WCond.ref

...ntSelectorAthenaPool/src/AthenaPoolAddressProviderSvc.cxx

...L/EventSelectorAthenaPool/src/EventSelectorAthenaPool.cxx