Removed the no longer used XRootdSSiRmcd sub-directory

CMakeLists.txt

XRootdSSiRmcd/CMakeLists.txt

XRootdSSiRmcd/Castor_limits.h

XRootdSSiRmcd/RmcdApi.hpp

XRootdSSiRmcd/RmcdClient.cpp

XRootdSSiRmcd/RmcdClient.hpp

XRootdSSiRmcd/RmcdRequestProc.cpp

XRootdSSiRmcd/RmcdServiceProvider.cpp

XRootdSSiRmcd/RmcdServiceProvider.hpp

XRootdSSiRmcd/cta-xrmcd.conf

XRootdSSiRmcd/cta-xrmcd.logrotate

XRootdSSiRmcd/cta-xrmcd.service

XRootdSSiRmcd/cta-xrmcd.sysconfig

XRootdSSiRmcd/cta-xsmc-dismount.1cta

XRootdSSiRmcd/cta-xsmc-mount.1cta

XRootdSSiRmcd/protobuf/CMakeLists.txt

XRootdSSiRmcd/protobuf/rmc_test.proto

XRootdSSiRmcd/rbtsubr_constants.h

XRootdSSiRmcd/rmc_constants.h

XRootdSSiRmcd/rmc_send_scsi_cmd.cpp