[CTA-EOS] Merge from master

cta.spec.in

objectstore/ArchiveRequest.cpp

objectstore/ArchiveRequest.hpp

objectstore/Helpers.cpp

objectstore/ObjectOps.hpp

objectstore/cta.proto

scheduler/OStoreDB/MemQueues.hpp

scheduler/OStoreDB/OStoreDB.cpp

scheduler/OStoreDB/OStoreDB.hpp

scheduler/OStoreDB/OStoreDBFactory.hpp

scheduler/SchedulerDatabase.hpp

xroot_plugins/CMakeLists.txt

xroot_plugins/OpaqueQueryCmd.cpp

xroot_plugins/OpaqueQueryCmd.hpp

xroot_plugins/OpaqueQueryCmdLineArgs.cpp

xroot_plugins/OpaqueQueryCmdLineArgs.hpp

xroot_plugins/OpaqueQueryCmdMain.cpp

xroot_plugins/WriteNotificationMsgCmd.cpp

xroot_plugins/WriteNotificationMsgCmd.hpp

xroot_plugins/WriteNotificationMsgCmdLineArgs.cpp