First draft of server-side tpconfig handler

castor/tape/legacymsg/AdminMarshal.cpp

castor/tape/legacymsg/AdminMarshal.hpp

castor/tape/legacymsg/CMakeLists.txt

castor/tape/legacymsg/TapeMsgBody.cpp

castor/tape/legacymsg/TapeMsgBody.hpp

castor/tape/tapeserver/daemon/AdminAcceptHandler.cpp

castor/tape/tapeserver/daemon/AdminAcceptHandler.hpp

castor/tape/tapeserver/daemon/CMakeLists.txt

castor/tape/tapeserver/daemon/Constants.hpp

castor/tape/tapeserver/daemon/TapeDaemon.cpp

test/CMakeLists.txt