set_sd_state:	Handle sd_empty correctly.  In particular, require 		force to bring a subdisk of a RAID-5 plex out of this 		state.
set_sd_state:	Handle sd_empty correctly.  In particular, require
		force to bring a subdisk of a RAID-5 plex out of this
		state.

update_plex_state:  Rewrite yet again.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase