node e2e Output failed health checks as string not bytes

test/e2e_node/e2e_service.go

@@ -155,7 +155,7 @@ func (es *e2eService) startServer(cmd *healthCheckCommand) error {
 	go func() {
 		err := cmd.Run()
 		if err != nil {
-			cmdErrorChan <- fmt.Errorf("%s Exited with status %v.  Output:\n%v", cmd, err, *cmd.OutputBuffer)
+			cmdErrorChan <- fmt.Errorf("%s Exited with status %v.  Output:\n%s", cmd, err, *cmd.OutputBuffer)
 		}
 		close(cmdErrorChan)
 	}()