buildman: Print a message indicating the build is starting

Make it clear when buildman actually starts building. This happens when it
has prepared the threads, working directory and output directories.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/buildman/builder.py

@@ -1430,6 +1430,7 @@ class Builder:
         self._PrepareWorkingSpace(min(self.num_threads, len(board_selected)),
                 commits is not None)
         self._PrepareOutputSpace()
+        Print('\rStarting build...', newline=False)
         self.SetupBuild(board_selected, commits)
         self.ProcessResult(None)
 

tools/buildman/test.py

@@ -198,9 +198,9 @@ class TestBuild(unittest.TestCase):
             if line.text.strip():
                 count += 1
 
-        # We should get one starting message, then an update for every commit
+        # We should get two starting messages, then an update for every commit
         # built.
-        self.assertEqual(count, len(commits) * len(boards) + 1)
+        self.assertEqual(count, len(commits) * len(boards) + 2)
         build.SetDisplayOptions(show_errors=True);
         build.ShowSummary(self.commits, board_selected)
         #terminal.EchoPrintTestLines()