improved log and several bugs fixed

castor/tape/tapegateway/ITapeGatewaySvc.hpp

castor/tape/tapegateway/Imakefile

castor/tape/tapegateway/NsTapeGatewayHelper.cpp

castor/tape/tapegateway/NsTapeGatewayHelper.hpp

castor/tape/tapegateway/TapeGatewayDaemon.cpp

castor/tape/tapegateway/TapeStreamLinkerThread.cpp

castor/tape/tapegateway/VdqmTapeGatewayHelper.cpp

castor/tape/tapegateway/VmgrTapeGatewayHelper.cpp

castor/tape/tapegateway/WorkerThread.cpp

castor/tape/tapegateway/ora/OraTapeGatewaySvc.cpp

castor/tape/tapegateway/ora/OraTapeGatewaySvc.hpp