If a request is received to load a metric plugin, and said plugin is already loaded, then the same status is returned as a failed load. This results in a "couldn't load plugin" error being logged in /var/log/messages. The error is misleading since nothing really failed. If a plugin is already loaded treat a load request as successful.
If a plugin is already loaded then success on load request
Patch attached.
Committed to CVS Head.
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