feat(plugins): adds warn log for scanning folders

symlinks outside to plugin folder can cause problems.
This commit makes sure to warn about it in the logs

pkg/plugins/plugins.go

@@ -55,6 +55,7 @@ func scan(pluginDir string) error {
 	}
 
 	if err := util.Walk(pluginDir, true, true, scanner.walker); err != nil {
+		log.Warn("Failed to scan dir \"%v\" error: %s", pluginDir, err)
 		return err
 	}