Improved the unit tests for Scheduler and SchedulerDatabase.

common/Utils.cpp

common/Utils.hpp

common/UtilsTest.cpp

middletier/SQLite/SqliteMiddleTierUser.cpp

nameserver/MockNameServer.cpp

nameserver/MockNameServerTest.cpp

scheduler/CMakeLists.txt

scheduler/MockSchedulerDatabase.cpp

scheduler/MockSchedulerDatabase.hpp

scheduler/MockSchedulerDatabaseFactory.cpp

scheduler/MockSchedulerDatabaseFactory.hpp

scheduler/Scheduler.cpp

scheduler/Scheduler.hpp

scheduler/SchedulerDatabase.hpp

scheduler/SchedulerDatabaseFactory.hpp

scheduler/SchedulerDatabaseTest.cpp

scheduler/SchedulerTest.cpp

scheduler/UserIdentity.cpp

scheduler/UserIdentity.hpp

scheduler/UserIdentityTest.cpp