Add debugging to bootstrap script

tools/buildbot/bootstrap.py

@@ -89,10 +89,14 @@ def main():
 
     with Chdir('..'):
         if output_needs_cleaning():
+            print("Cleaning output directory...")
             shutil.rmtree('OUTPUT')
         if not os.path.isdir('OUTPUT'):
+            print("Creating output directory...")
             os.mkdir('OUTPUT')
+        print("Changing to output directory...")
         with Chdir('OUTPUT'):
+            print("Running configure.py...")
             run_shell(config_argv, env = build_env)
 
 if __name__ == '__main__':