Better logging of plugin version on load, unload and reload

When a plugin is reloaded explicitly by the user, it makes more sense
to log the version that was newly loaded than the version that is
currently running and will be replaced.

Add a separate log on unload to explicitly show the version that is
being unloaded.

When a plugin is loaded or reloaded by the plugin scanner, log the new
version that has been loaded.

Change-Id: Iebee78bde188db15a495b55c32b4ba8c458b2d37
1 file changed