Re-fetch StateSensors if unable to find sensor

Saw defect after BMC reset/reload where occ-control only saw PDR for
first OCC. Code change will re-fetch the sensors in the case where an
expected PDR was not found.

Testing:
Forced removal of sensors which triggered the fetch and saw recovery.

Change-Id: I6e180f23b5817bc9ea0575674a318a2673f66f3d
Signed-off-by: Chris Cain <cjcain@us.ibm.com>
1 file changed