message: pass -q flag to test harness
diff: @@ -140,6 +140,10 @@ pub fn exec(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
  .map(|s| s.to_string()),
  );
  + if args.is_present("quiet") {
  + test_args.push("-q".to_string())
  + }
  +
  let err = ops::run_tests(&ws, &ops, &test_args)?;
  match err {
  None => Ok(()),
  