Metadata handling fixes,ATLASG-1347, minor cleanup

...fficiencyCorrection/AsgElectronEfficiencyCorrectionTool.h

...nEfficiencyCorrection/TElectronEfficiencyCorrectionTool.h

...cyCorrection/Root/AsgElectronEfficiencyCorrectionTool.cxx

...encyCorrection/Root/TElectronEfficiencyCorrectionTool.cxx

...lectronEfficiencyCorrection/util/testEgEfficiencyCorr.cxx

...entumCorrection/Root/EgammaCalibrationAndSmearingTool.cxx

...ciencyCorrection/Root/TPhotonEfficiencyCorrectionTool.cxx