Added support for archive job error reporting to EOS.

common/dataStructures/ArchiveRequest.cpp

common/dataStructures/ArchiveRequest.hpp

eos/DiskReporterFactory.hpp

objectstore/ArchiveRequest.cpp

objectstore/ArchiveRequest.hpp

objectstore/GarbageCollectorTest.cpp

objectstore/cta.proto

scheduler/ArchiveJob.cpp

scheduler/OStoreDB/OStoreDB.cpp

scheduler/OStoreDB/OStoreDB.hpp

scheduler/OStoreDB/OStoreDBTest.cpp

scheduler/Scheduler.cpp

scheduler/SchedulerDatabase.hpp

scheduler/SchedulerTest.cpp

xroot_plugins/XrdSsiCtaRequestMessage.cpp