Remove unused variables / code (#7736)

* remove unused variables / code

* fix bug in testPostStoreGetOldest

utils/logger/logger.go

@@ -28,15 +28,14 @@ var infoLog = l4g.Info
 var errorLog = l4g.Error
 
 func init() {
+	// listens for configuration changes that we might need to respond to
+	utils.AddConfigListener(func(oldConfig *model.Config, newConfig *model.Config) {
+		infoLog("Configuration change detected, reloading log settings")
+		initL4g(newConfig.LogSettings)
+	})
 	initL4g(utils.Cfg.LogSettings)
 }
 
-// listens for configuration changes that we might need to respond to
-var configListenerID = utils.AddConfigListener(func(oldConfig *model.Config, newConfig *model.Config) {
-	infoLog("Configuration change detected, reloading log settings")
-	initL4g(newConfig.LogSettings)
-})
-
 // assumes that ../config.go::configureLog has already been called, and has in turn called l4g.close() to clean up
 // any old filters that we might have previously created
 func initL4g(logSettings model.LogSettings) {