Moved SmartFd into CTA common

common/CMakeLists.txt

common/SmartFd.cpp

common/SmartFd.hpp

common/SmartFdTest.cpp

tapeserver/castor/io/IoTest.cpp

tapeserver/castor/io/io.cpp

tapeserver/castor/legacymsg/RmcProxyTcpIp.cpp

tapeserver/castor/legacymsg/RmcProxyTcpIp.hpp

...tape/tapeserver/daemon/ProcessForkerConnectionHandler.cpp

...erver/castor/tape/tapeserver/daemon/ProcessForkerTest.cpp

tapeserver/castor/tape/tapeserver/daemon/TapeDaemon.cpp

tapeserver/castor/utils/CMakeLists.txt