Ignore context canceled error when reloading/stopping agent

cmd/telegraf/telegraf.go

@@ -103,7 +103,7 @@ func reloadLoop(
 		}()
 
 		err := runAgent(ctx, inputFilters, outputFilters)
-		if err != nil {
+		if err != nil && err != context.Canceled {
 			log.Fatalf("E! [telegraf] Error running agent: %v", err)
 		}
 	}