Refactored the mock database

libs/middletier/CMakeLists.txt

libs/middletier/MockAdminHostDatabase.cpp

libs/middletier/MockAdminHostDatabase.hpp

libs/middletier/MockAdminHostDatabaseTest.cpp

libs/middletier/MockAdminUserDatabase.cpp

libs/middletier/MockAdminUserDatabase.hpp

libs/middletier/MockAdminUserDatabaseTest.cpp

libs/middletier/MockDatabase.cpp

libs/middletier/MockDatabase.hpp

libs/middletier/MockLogicalLibraryDatabase.cpp

libs/middletier/MockLogicalLibraryDatabase.hpp

libs/middletier/MockLogicalLibraryDatabaseTest.cpp

libs/middletier/MockMiddleTierAdmin.cpp

libs/middletier/MockMiddleTierAdmin.hpp

libs/middletier/MockMiddleTierAdminTest.cpp

libs/middletier/MockMiddleTierUser.cpp

libs/middletier/MockMiddleTierUser.hpp

libs/middletier/MockMiddleTierUserTest.cpp

libs/middletier/MockMigrationRouteDatabase.cpp

libs/middletier/MockMigrationRouteDatabase.hpp