Merge "Build process outputs each line twice"

kolla/image/build.py

@@ -63,6 +63,7 @@ def make_a_logger(conf=None, image_name=None):
     if not log.handlers:
         if conf is None or not conf.logs_dir or not image_name:
             handler = logging.StreamHandler(sys.stdout)
+            log.propagate = False
         else:
             filename = os.path.join(conf.logs_dir, "%s.log" % image_name)
             handler = logging.FileHandler(filename, delay=True)