Unified LSMONITOR for Debian System in LinkStation LS421DE

You have done replacing Buffalo stock firmware with Debian, the last part is to adjust the hardware behavior to match the new operating system. This work initially done by Sergej Wildemann for LinkStation Live V2 with my modification for LinkStation LS421DE for both Buffalo kernel and vanilla one. What’s LSMONITOR jobs: Controlling LED according to the current …