AthenaKernel+CxxUtils+StoreGate+IOVSvc+AthenaServices: More CondCont simplification

Control/AthenaKernel/AthenaKernel/CondCont.h

Control/AthenaKernel/AthenaKernel/CondCont.icc

Control/AthenaKernel/AthenaKernel/IConditionsCleanerSvc.h

Control/AthenaKernel/share/CondCont_test.ref

Control/AthenaKernel/src/CondCont.cxx

Control/AthenaKernel/test/CondCont_test.cxx

Control/AthenaServices/share/ConditionsCleanerSvc_test.ref

Control/AthenaServices/src/ConditionsCleanerSvc.cxx

Control/AthenaServices/src/ConditionsCleanerSvc.h

Control/AthenaServices/src/DelayedConditionsCleanerSvc.cxx

Control/AthenaServices/src/DelayedConditionsCleanerSvc.h

Control/AthenaServices/test/ConditionsCleanerSvc_test.cxx

.../AthenaServices/test/DelayedConditionsCleanerSvc_test.cxx

Control/CxxUtils/CxxUtils/ConcurrentRangeMap.h

Control/CxxUtils/CxxUtils/ConcurrentRangeMap.icc

Control/CxxUtils/share/ConcurrentRangeMap_test.ref

Control/CxxUtils/test/ConcurrentRangeMap_test.cxx

Control/IOVSvc/src/CondInputLoader.cxx

Control/IOVSvc/src/IOVSvc.cxx

Control/StoreGate/StoreGate/WriteCondHandle.h