Merge remote-tracking branch 'origin/master' into cta_admin

catalogue/CatalogueTest.cpp

catalogue/DropSqliteCatalogueSchema.before_SQL.cpp

objectstore/AgentWatchdog.hpp

objectstore/ArchiveRequest.cpp

objectstore/ArchiveRequest.hpp

objectstore/BackendPopulator.cpp

objectstore/GarbageCollector.cpp

objectstore/GarbageCollector.hpp

objectstore/RetrieveQueue.cpp

objectstore/RetrieveQueueTest.cpp

objectstore/RetrieveRequest.cpp

objectstore/RetrieveRequest.hpp

scheduler/OStoreDB/OStoreDB.cpp