- Fix a bug where a "power_off_slot' timeout was not cancelled when the   computer 'suspended', although the slot was powered off.  There was a   race where the slow could be powered off *after* it was assigned a   new driver when the computer was 'resumed'.
- Fix a bug where a "power_off_slot' timeout was not cancelled when the
  computer 'suspended', although the slot was powered off.  There was a
  race where the slow could be powered off *after* it was assigned a
  new driver when the computer was 'resumed'.

Noticed by:	Brian Somers <brian@Awfulhak.org>

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