Improved cta-admin --json dr ls command

cmdline/CtaAdminTextFormatter.cpp

common/dataStructures/DriveState.hpp

objectstore/DriveState.cpp

objectstore/DriveState.hpp

objectstore/cta.proto

scheduler/OStoreDB/OStoreDB.cpp

scheduler/OStoreDB/OStoreDB.hpp

scheduler/OStoreDB/OStoreDBFactory.hpp

scheduler/Scheduler.cpp

scheduler/Scheduler.hpp

scheduler/SchedulerDatabase.hpp

tapeserver/daemon/DriveHandler.cpp

xroot_plugins/XrdCtaDriveLs.hpp

xrootd-ssi-protobuf-interface