message: Avoid randomly printing "Fresh" for the doc test unit.
diff: @@ -410,6 +410,8 @@ impl<'a> JobQueue<'a> {
  ) -> CargoResult<()> {
  if (self.compiled.contains(key.pkg) && !key.mode.is_doc())
  || (self.documented.contains(key.pkg) && key.mode.is_doc())
  + // Skip doctest, it is a dummy entry that is always fresh.
  + || key.mode == CompileMode::Doctest
  {
  return Ok(());
  }
  @@ -419,11 +421,8 @@ impl<'a> JobQueue<'a> {
  // being a compiled package
  Dirty => {
  if key.mode.is_doc() {
  - // Skip Doctest
  - if !key.mode.is_any_test() {
  self.documented.insert(key.pkg);
  config.shell().status("Documenting", key.pkg)?;
  - }
  } else {
  self.compiled.insert(key.pkg);
  if key.mode.is_check() {
  