Fix to accommodate fault LED string change.

 -System Fault LED string changed from "fault" to "rear_fault"
  recently

Resolves openbmc/openbmc-test-automation#700

Change-Id: I90059b832acd30d761a58954f54fed34d301373f
Signed-off-by: Sweta Potthuri <spotthur@in.ibm.com>
1 file changed