Queue verification jobs with hardcoded mount policy (#1198)

ReleaseNotes.md

catalogue/Catalogue.hpp

catalogue/CatalogueRetryWrapper.hpp

catalogue/CatalogueTest.cpp

catalogue/DummyCatalogue.hpp

catalogue/RdbmsCatalogue.cpp

catalogue/RdbmsCatalogue.hpp

common/dataStructures/RetrieveRequest.hpp

scheduler/Scheduler.cpp

scheduler/SchedulerTest.cpp

xroot_plugins/XrdSsiCtaRequestMessage.cpp

xroot_plugins/XrdSsiCtaRequestMessage.hpp

xroot_plugins/XrdSsiCtaServiceProvider.cpp

xroot_plugins/XrdSsiCtaServiceProvider.hpp

xroot_plugins/cta-frontend-xrootd.conf