Removed Zmq classes from tapeserver/castor

tapeserver/castor/messages/CMakeLists.txt

tapeserver/castor/messages/Frame.cpp

tapeserver/castor/messages/Frame.hpp

tapeserver/castor/messages/MessagesTest.cpp

tapeserver/castor/messages/ZmqMsg.cpp

tapeserver/castor/messages/ZmqMsg.hpp

tapeserver/castor/messages/ZmqSocket.cpp

tapeserver/castor/messages/ZmqSocket.hpp

tapeserver/castor/messages/ZmqSocketMT.cpp

tapeserver/castor/messages/ZmqSocketMT.hpp

tapeserver/castor/messages/ZmqSocketST.cpp

tapeserver/castor/messages/ZmqSocketST.hpp

tapeserver/castor/messages/messages.cpp

tapeserver/castor/messages/messages.hpp

tests/CMakeLists.txt