Moved the castor::tape::aggregator::utils package to castor::tape::utils. This

castor/tape/aggregator/AggregatorDaemon.cpp

castor/tape/aggregator/AggregatorMain.cpp

castor/tape/aggregator/BridgeProtocolEngine.cpp

castor/tape/aggregator/DriveAllocationProtocolEngine.cpp

castor/tape/aggregator/GatewayTxRx.cpp

castor/tape/aggregator/Imakefile

castor/tape/aggregator/Marshaller.cpp

castor/tape/aggregator/Net.cpp

castor/tape/aggregator/Packer.cpp

castor/tape/aggregator/RcpJobSubmitter.cpp

castor/tape/aggregator/RtcpTxRx.cpp

castor/tape/aggregator/SmartFd.cpp

castor/tape/aggregator/SmartFdList.cpp

castor/tape/aggregator/SynchronizedCounter.cpp

castor/tape/aggregator/Unpacker.cpp

castor/tape/aggregator/VdqmRequestHandler.cpp

castor/tape/utils/utils.cpp

castor/tape/utils/utils.hpp