Resolve "Remove cta-admin schedulinginfo subcommand"

cmdline/CtaAdminCmd.cpp

cmdline/CtaAdminCmdParse.hpp

cmdline/CtaAdminTextFormatter.cpp

cmdline/CtaAdminTextFormatter.hpp

cmdline/cta-admin.1cta

scheduler/CMakeLists.txt

scheduler/GenericSchedulerTest.cpp

scheduler/Scheduler.cpp

scheduler/Scheduler.hpp

scheduler/SchedulerTest.cpp

scheduler/SchedulingInfos.cpp

scheduler/SchedulingInfos.hpp

xroot_plugins/XrdSsiCtaRequestMessage.cpp

xroot_plugins/XrdSsiCtaRequestMessage.hpp