#533: Implemented unit test for retrieve queue sleeping.

objectstore/RetrieveQueue.hpp

objectstore/RetrieveQueueAlgorithms.hpp

objectstore/RetrieveQueueShard.cpp

objectstore/RetrieveQueueToTransferAlgorithms.cpp

objectstore/Sorter.cpp

scheduler/OStoreDB/OStoreDB.cpp

scheduler/RetrieveMount.cpp

scheduler/SchedulerDatabase.hpp

scheduler/SchedulerDatabaseTest.cpp