Removed obsolete ArchivalMount, Mount and RetrievalMount classes

scheduler/ArchivalMount.cpp

scheduler/ArchivalMount.hpp

scheduler/CMakeLists.txt

scheduler/MockSchedulerDatabase.cpp

scheduler/MockSchedulerDatabase.hpp

scheduler/Mount.cpp

scheduler/Mount.hpp

scheduler/OStoreDB/OStoreDB.cpp

scheduler/OStoreDB/OStoreDB.hpp

scheduler/OStoreDB/OStoreDBFactory.hpp

scheduler/RetrievalMount.cpp

scheduler/RetrievalMount.hpp

scheduler/Scheduler.hpp

scheduler/SchedulerDatabase.hpp

scheduler/Tape.cpp

scheduler/Tape.hpp