Renamed directory namespace to nameserver.

CMakeLists.txt

middletier/SQLite/SqliteMiddleTierAdmin.hpp

middletier/SQLite/SqliteMiddleTierTest.cpp

middletier/SQLite/SqliteMiddleTierUser.hpp

nameserver/CMakeLists.txt

nameserver/MockNameServer.cpp

nameserver/MockNameServer.hpp

nameserver/MockNameServerTest.cpp

nameserver/NameServer.cpp

nameserver/NameServer.hpp

nameserver/Vfs.cpp

nameserver/Vfs.hpp

nameserver/VfsTest.cpp