Correction of the log output of the practice node of stonith.

Correction of a possible point of the influence.
Correction of the log output of the practice node of stonith.(2)

Revise one next correction.
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https://github.com/ClusterLabs/pacemaker/commit/a932361589964545f76376009d7ff7a61f03cab3
Merge pull request #584 from HideoYamauchi/change_log

Correction of the log output of the practice node of stontih.