Yet another round of coverity deffects fixes

castor/db/ora/OraStagerSvc.cpp

castor/db/ora/OraVdqmSvc.cpp

castor/io/UDPSocket.cpp

castor/job/stagerjob/StagerJob.cpp

castor/monitoring/rmmaster/CollectorThread.hpp

castor/monitoring/rmnode/MetricsThread.hpp

castor/sharedMemory/BasicBlock.cpp

castor/sharedMemory/Block.hpp

castor/sharedMemory/BlockKey.cpp

castor/stager/daemon/ErrorSvcThread.cpp

castor/stager/daemon/GcSvcThread.cpp

castor/stager/daemon/ReplyHelper.hpp

castor/stager/daemon/RequestHelper.cpp

castor/tape/tapegateway/daemon/ora/OraTapeGatewaySvc.hpp

castor/tape/utils/ScopedLock.cpp

castor/tape/utils/ScopedLock.hpp

castor/tape/utils/SmartFdList.cpp

castor/tape/utils/SmartFdList.hpp

castor/vdqm/VdqmMagic4ProtocolInterpreter.cpp

castor/vdqm/handler/TapeDriveConsistencyChecker.cpp